Deltopectoral Approach: Comprehensive Guide to the Deltopectoral

Deltopectoral Approach: Comprehensive Guide to the Deltopectoral

Introduction & Epidemiology

The deltopectoral approach is the workhorse anterior surgical approach to the shoulder, providing extensive exposure to the glenohumeral joint, proximal humerus, and periscapular structures. First described in detail by Henry in his seminal work "Extensile Exposure," its utility has been refined and expanded over decades, becoming an indispensable tool in the armamentarium of an orthopedic surgeon. This approach capitalizes on a natural internervous plane, minimizing muscle disruption and preserving the functional integrity of the deltoid, which is critical for post-operative shoulder function.

Epidemiologically, conditions managed through the deltopectoral approach are prevalent. Proximal humerus fractures, for instance, account for approximately 5-6% of all fractures, with a bimodal distribution affecting young, active individuals and, more commonly, elderly osteoporotic patients. Glenohumeral osteoarthritis affects a significant portion of the aging population, leading to an increasing demand for total shoulder arthroplasty (TSA) and hemiarthroplasty. Shoulder instability, particularly anterior instability, is common in young, athletic populations, often requiring surgical stabilization such as Bankart repair or Latarjet procedures. Subscapularis tears, although less frequent than supraspinatus tears, often necessitate an anterior repair and are amenable to this approach. The deltopectoral approach remains the standard for many reconstructive and trauma procedures of the shoulder due to its versatility and established track record.

Surgical Anatomy & Biomechanics

A thorough understanding of the surgical anatomy is paramount for safe and effective utilization of the deltopectoral approach. The approach navigates the interval between the deltoid and pectoralis major muscles.

Surface Anatomy

Key surface landmarks include the clavicle, the acromion, the coracoid process, and the deltoid and pectoralis major muscle outlines. The deltopectoral groove is often visible or palpable, defining the intermuscular plane.

Superficial Anatomy

The skin incision typically extends from the inferior aspect of the coracoid process, following Langer's lines, distally along the deltopectoral groove for approximately 8-12 cm, depending on the required exposure. Subcutaneous dissection reveals the fascial layers and often the cephalic vein lying within the deltopectoral groove.

Deep Anatomy

Deltopectoral Interval

This is the critical intermuscular plane.
* Deltoid Muscle: Originates from the lateral third of the clavicle, acromion, and spine of the scapula. It inserts onto the deltoid tuberosity of the humerus. It is innervated by the axillary nerve (C5, C6).
* Pectoralis Major Muscle: Originates from the medial half of the clavicle, sternum, costal cartilages 2-6, and aponeurosis of the external oblique. It inserts onto the lateral lip of the bicipital groove of the humerus. It is innervated by the medial and lateral pectoral nerves (C5-T1).
* Cephalic Vein: A consistent landmark found within the deltopectoral groove. It typically courses superiorly from the forearm to enter the axillary vein under the clavicle. It can be retracted either laterally with the deltoid or medially with the pectoralis major. Medial retraction is often preferred to protect the axillary nerve, which lies laterally, and to avoid kinking the vein and impeding venous return. Ligation is an option if retraction is insufficient or if the vein is injured, though venous congestion can ensue.
* Deltoid Branch of the Thoracoacromial Artery: This artery, accompanying the cephalic vein, is a smaller but consistent vessel that can be encountered and requires cauterization or ligation.

Deeper Structures

Upon identifying and developing the deltopectoral interval, the surgeon proceeds through layers of fascia:
* Clavipectoral Fascia: A strong fascial layer deep to the pectoralis major and deltoid, extending from the clavicle to the axillary fascia. It invests the pectoralis minor and subclavius muscles. Incision of this fascia inferior to the clavicle, parallel to the deltopectoral interval, exposes the underlying structures.
* Coracoid Process: A critical bony landmark, serving as the origin for the coracobrachialis and short head of the biceps brachii (forming the conjoined tendon), and the pectoralis minor.
* Musculocutaneous Nerve: Enters the deep surface of the coracobrachialis muscle approximately 5-8 cm distal to the coracoid tip. Care must be taken during dissection around the conjoined tendon, particularly if it is mobilized or tenotomized.
* Pectoralis Minor Muscle: Originates from ribs 3-5 and inserts onto the coracoid process. It lies deep to the pectoralis major and superficial to the axillary neurovascular bundle.
* Axillary Neurovascular Bundle: Situated medial and deep to the coracoid process. This bundle contains the axillary artery, axillary vein, and brachial plexus cords (lateral, posterior, medial). Retraction of the conjoined tendon medially allows access to the subscapularis, but extreme medial retraction risks injury to this bundle.
* Subscapularis Muscle: The anterior rotator cuff muscle, originating from the subscapular fossa and inserting onto the lesser tuberosity of the humerus. It is innervated by the upper and lower subscapular nerves (C5-C7), which arise directly from the posterior cord of the brachial plexus. These nerves enter the deep surface of the muscle, making muscle splitting less risky than extensive subscapularis mobilization without careful nerve identification.
* Axillary Nerve: Courses inferiorly and then posteriorly around the surgical neck of the humerus, approximately 5-7 cm distal to the acromion, after passing through the quadrangular space. Its anterior branch supplies the anterior deltoid. Its close proximity to the inferior capsule and surgical neck of the humerus makes it vulnerable during capsular releases, humeral head resection, and fracture fixation. It is often accompanied by the posterior humeral circumflex artery. The anterior humeral circumflex artery branches off the axillary artery, runs anteriorly, and anastomoses with the posterior humeral circumflex artery.

Biomechanics

The biomechanical advantage of the deltopectoral approach lies in its respect for the integrity of the deltoid muscle. By dissecting along an internervous plane, the muscle fibers are not transected, preserving the deltoid's origin, insertion, and innervation. This minimizes post-operative weakness and facilitates early rehabilitation. The anterior capsule, which provides significant static stability, is incised to gain access to the joint. The method of subscapularis management (tenotomy vs. peel) has biomechanical implications for post-operative rotator cuff integrity and strength. Proper repair of the subscapularis and capsule is critical to prevent anterior instability and maintain joint function. Excessive or uncontrolled retraction can lead to iatrogenic nerve injury (axillary, musculocutaneous) or vascular compromise.

Indications & Contraindications

The deltopectoral approach offers versatility for a wide array of shoulder pathologies.

Indications

Operative Indications (Deltopectoral Approach Commonly Employed)

• Proximal Humerus Fractures: 2-, 3-, and 4-part fractures requiring open reduction and internal fixation (ORIF) with plates and screws (e.g., locking plates). Hemiarthroplasty or reverse total shoulder arthroplasty (RTSA) for highly comminuted or head-splitting fractures in elderly patients.
• Glenohumeral Arthroplasty:
  • Total Shoulder Arthroplasty (TSA): For glenohumeral osteoarthritis, inflammatory arthritis (e.g., rheumatoid arthritis), or osteonecrosis.
  • Hemiarthroplasty: For proximal humerus fractures, osteonecrosis, or glenoid-sparing arthritis.
  • Reverse Total Shoulder Arthroplasty (RTSA): For rotator cuff tear arthropathy, failed TSA, severe proximal humerus fractures in elderly, or revision cases. The approach may need to be extended superiorly for RTSA.
• Anterior Glenohumeral Instability:
  • Bankart Repair: Open repair of anterior labral avulsion.
  • Capsular Shift/Plication: For capsular laxity.
  • Latarjet Procedure: Coracoid transfer for recurrent anterior instability with significant bone loss or failed soft tissue repairs.
• Rotator Cuff Repair: Primarily for large or retracted subscapularis tears.
• Acromioclavicular (AC) Joint Pathology: Reconstruction of chronic AC joint dislocations, distal clavicle fracture fixation.
• Tumor Resection: Biopsy or resection of benign or malignant tumors of the proximal humerus or glenoid.
• Infection: Debridement of septic arthritis of the glenohumeral joint or osteomyelitis of the proximal humerus.
• Hardware Removal: Extraction of previously placed implants in the proximal humerus or glenoid.
• Glenoid Fractures: Open reduction and internal fixation of certain glenoid fractures (e.g., anterior rim fractures).

Non-Operative Considerations for Underlying Conditions

While the deltopectoral approach is inherently surgical, certain conditions that could be treated operatively via this approach often have non-operative management as a primary treatment. The decision to proceed with surgery (and thus the deltopectoral approach) is based on patient factors, fracture pattern, instability severity, and functional demands.
* Minimally Displaced Proximal Humerus Fractures: Often managed with immobilization and early rehabilitation.
* Mild Glenohumeral Osteoarthritis: Initial management typically involves activity modification, NSAIDs, physical therapy, and injections.
* First-Time Traumatic Anterior Shoulder Dislocation (without significant bone loss): Often managed with reduction, immobilization, and rehabilitation, especially in older or less active individuals.
* Small, Partial-Thickness Subscapularis Tears: May respond to conservative management, including physical therapy.

Contraindications

• Active Infection in the Surgical Field: A relative contraindication. Surgery may proceed after appropriate antibiotic treatment and source control, but it significantly increases complication risk.
• Extensive Scarring/Prior Surgery: Significant scarring from previous surgeries in the deltopectoral interval can obliterate the plane, making dissection difficult and increasing the risk of iatrogenic injury.
• Severe Axillary Nerve Palsy: While not an absolute contraindication, if the deltoid is already compromised, preservation of its remaining function is paramount, and alternative approaches (e.g., anterolateral/deltoid-splitting) might be considered for specific pathologies, especially if the primary pathology requires extensive anterior deltoid mobilization.
• Significant Defect/Loss of Deltopectoral Interval: Due to trauma or previous surgery, rendering the plane unusable.
• Pathology Better Addressed by Other Approaches: For example, posterior glenoid fractures or posterior instability often require a posterior approach. Superior glenoid pathology or massive superior rotator cuff tears might be better accessed via a superior approach or deltoid-splitting approach.

Pre-Operative Planning & Patient Positioning

Careful pre-operative planning and meticulous patient positioning are crucial for maximizing exposure and minimizing complications with the deltopectoral approach.

Pre-Operative Planning

1. Clinical Assessment: A thorough history and physical examination are essential. Assess neurovascular status, pre-existing shoulder function, and comorbidities.
2. Imaging Review:
   • Plain Radiographs: Standard AP, scapular Y, and axillary views provide basic bony anatomy. For trauma, true AP and trans-scapular Y views are critical.
   • Computed Tomography (CT) Scan: Indispensable for complex fractures (3D reconstructions) to assess comminution, articular involvement, and glenoid morphology. For arthroplasty, CT helps evaluate glenoid version, retroversion, and bone stock.
   • Magnetic Resonance Imaging (MRI): Crucial for evaluating soft tissue pathology, including rotator cuff tears, labral injuries, and capsular integrity, particularly in instability cases or when considering revision surgery.
3. Surgical Strategy: Based on imaging and clinical assessment, determine the specific procedure, implant choice, and potential variations in the approach (e.g., subscapularis tenotomy vs. lesser tuberosity osteotomy vs. peel, need for extended exposure).
4. Templating: For arthroplasty, templating helps predict implant size, glenoid component placement, and humeral head resection level.
5. Patient Education & Consent: Beyond the standard surgical risks, discuss procedure-specific risks relevant to the deltopectoral approach, such as nerve injury (axillary, musculocutaneous), bleeding, infection, and potential need for blood transfusion. Ensure the patient understands the post-operative rehabilitation expectations.
6. Anesthesia Consultation: Evaluate patient fitness for general anesthesia. Regional anesthesia (interscalene block) can be highly beneficial for post-operative pain control.

Patient Positioning

The two primary positions for the deltopectoral approach are the beach chair position and the supine position.

1. Beach Chair Position

This is the most common position for the deltopectoral approach, particularly for arthroplasty, instability, and many fracture fixations.
* Advantages:
* Gravity Assists Exposure: The arm hangs naturally, facilitating humeral head dislocation and glenoid exposure.
* Excellent Surgical Ergonomics: Allows the surgeon to operate from above, with good visualization of superior structures.
* Reduced Blood Loss: Hypotensive anesthesia in this semi-upright position can reduce intraoperative bleeding.
* Ease of Converting to Arthroscopic Procedures: If necessary, though less common with an open approach.
* Disadvantages:
* Risk of Cerebral Hypoperfusion: Careful monitoring of blood pressure is essential.
* Potential for Air Embolism: Rare, but a serious complication.
* Neck and Head Positioning: Requires careful padding and stabilization to prevent nerve palsy (e.g., brachial plexus, ulnar nerve) or pressure injuries.
* Setup:
* Patient is placed on an operating table that allows for articulation, typically with the torso elevated 30-70 degrees.
* Head is supported in a headrest (e.g., Mayfield) with the neck in a neutral position, slightly flexed and rotated away from the operative shoulder. Ensure adequate padding to prevent pressure sores or neural compression.
* Torso secured to the table with chest straps.
* Legs are slightly flexed at the hips and knees, with careful padding under heels and calves.
* The non-operative arm is tucked and padded alongside the body.
* The operative arm is draped free or on an arm board, allowing for full range of motion. A sterile stockinette is typically applied, and the arm is prepped to the level of the hand.

2. Supine Position

Less commonly used for primary deltopectoral approaches but may be preferred in specific scenarios (e.g., complex trauma involving the chest wall, or when a large C-arm is required for fluoroscopy).
* Advantages:
* Hemodynamic Stability: Lower risk of cerebral hypoperfusion compared to beach chair.
* Access for C-arm Fluoroscopy: Easier to position a C-arm around the shoulder.
* Patient Transport: Easier for critically ill or polytrauma patients.
* Disadvantages:
* Gravity Works Against Exposure: May require more vigorous retraction and assist in subluxating the humeral head.
* More Challenging Ergonomics: The surgeon may need to operate from the side, which can be less comfortable for prolonged cases.
* Setup:
* Patient is placed supine on the operating table.
* A small bump or rolled towel may be placed under the ipsilateral scapula to protract the shoulder and provide better posterior support.
* Head is in a neutral position, supported with a soft pillow.
* Both arms are abducted approximately 45-90 degrees on arm boards, with careful padding to prevent neural compression.
* The operative arm is prepped and draped free, allowing full mobility.

Instrumentation & Equipment

Standard orthopedic surgical trays are required. Specific instruments include:
* Retractors: Hohmann retractors (various sizes), Army-Navy retractors, Darrach retractors, self-retaining retractors (e.g., Weitlaner, Omni-Tract) are essential for maintaining exposure.
* Electrocautery: For hemostasis and dissection.
* Sutures: Various sizes and types for soft tissue repair (subscapularis, capsule) and wound closure.
* Implants: Specific to the procedure (e.g., plates, screws, anchors, prosthetic components).
* Irrigation/Suction: To maintain a clear field.

Antibiotic Prophylaxis & Regional Anesthesia

• Antibiotic Prophylaxis: Administer pre-operative broad-spectrum antibiotics (e.g., cefazolin) within 60 minutes of incision, as per institutional protocol.
• Regional Anesthesia: An interscalene block can significantly reduce post-operative pain, decreasing reliance on opioids and improving early rehabilitation efforts. It should be administered pre-operatively by the anesthesia team.

Detailed Surgical Approach / Technique

The deltopectoral approach is characterized by a stepwise dissection, identifying key anatomical landmarks and respecting internervous planes to provide a safe and extensile exposure.

1. Skin Incision and Subcutaneous Dissection

• Incision: A curvilinear incision is made, starting just inferior to the coracoid process, following the deltopectoral groove distally for approximately 8-12 cm. The length is dictated by the pathology and required exposure. For arthroplasty, a longer incision is often needed than for instability repair.
• Subcutaneous Dissection: The incision is carried through the skin and subcutaneous fat. Superficial veins and nerves (e.g., supraclavicular cutaneous nerves) are identified and either preserved, ligated, or cauterized.

2. Deltopectoral Interval Identification

• Landmarks: The distinct muscular bellies of the deltoid (laterally) and pectoralis major (medially) are identified. Palpation of the coracoid process guides the superior aspect of the incision.
• Cephalic Vein: The cephalic vein, typically running within the deltopectoral groove, is the key anatomical landmark.
  • Management: It is usually retracted medially with the pectoralis major muscle. This minimizes traction on the deltoid and associated neurovascular structures (axillary nerve) and reduces the risk of injury to small deltoid branches of the thoracoacromial artery. If the vein is small or repeatedly obstructs the view, it can be ligated, though this should be avoided if possible to prevent post-operative arm swelling. Small branches entering the cephalic vein often require cauterization or ligation.
• Dissection: The loose areolar tissue in the deltopectoral interval is carefully dissected, allowing the deltoid and pectoralis major to be separated. Retractors (e.g., Army-Navy, Hohmann) are placed to maintain the separation.

3. Deep Dissection

• Clavipectoral Fascia: Deep to the pectoralis major, the clavipectoral fascia is encountered. This dense fascial layer covers the pectoralis minor and extends to the coracoid process. It is incised longitudinally, inferior to the clavicle, along the medial border of the coracobrachialis and short head of the biceps (conjoined tendon). This incision releases the fascia, allowing the pectoralis major to be further retracted medially.
• Coracoid Process and Conjoined Tendon: The coracoid process becomes clearly visible, with the conjoined tendon (coracobrachialis and short head of biceps) attaching to its tip.
• Retraction of Conjoined Tendon: The conjoined tendon can be retracted either medially or laterally.
  • Medial Retraction: Offers wider exposure to the anterior aspect of the glenohumeral joint and glenoid. However, extreme medial retraction risks injury to the musculocutaneous nerve (which enters the conjoined tendon) and, more importantly, the underlying axillary neurovascular bundle (axillary artery, vein, and brachial plexus cords).
  • Lateral Retraction: Provides a more direct view of the humeral head but limits exposure to the glenoid.
  • For most arthroplasty and instability procedures, medial retraction of the conjoined tendon is preferred to expose the subscapularis and anterior capsule. Gentle, sustained retraction is crucial.
• Exposure of Subscapularis: After retracting the conjoined tendon, the anterior capsule and the underlying subscapularis muscle and tendon are exposed. The inferior border of the subscapularis is important as the axillary nerve and anterior humeral circumflex artery pass inferior to it, close to the surgical neck of the humerus. A blunt Hohmann retractor can be placed under the inferior border of the subscapularis to protect the axillary nerve during subsequent dissection.

4. Subscapularis Management

The method of managing the subscapularis tendon depends on the surgical goal.
* Subscapularis Tenotomy: This is the most common approach for shoulder arthroplasty.
* The subscapularis tendon is sharply detached from its insertion on the lesser tuberosity. The length of tendon left on the lesser tuberosity should be adequate for subsequent repair.
* The incision can be made from superior to inferior or inferior to superior. For superior to inferior, care must be taken to protect the supraspinatus. For inferior to superior, careful protection of the axillary nerve is critical.
* Stay sutures are placed in the free edge of the subscapularis tendon for later repair and retraction.
* Subscapularis Peel (Capsular-Subscapularis Peel): Often used in instability surgery (e.g., Bankart repair).
* The anterior capsule and subscapularis tendon are peeled off the anterior glenoid rim and lesser tuberosity as a single layer. This preserves the tendon's length and allows for better capsular closure.
* This technique risks denervating the subscapularis if the deep muscle belly is dissected too extensively.
* Lesser Tuberosity Osteotomy: Less common, but an option for revision cases or situations requiring maximal exposure and bone integrity for reattachment.
* A small osteotomy is performed at the lesser tuberosity, reflecting the subscapularis tendon with a bone block.
* This provides a robust repair site but carries risks of non-union or avulsion of the osteotomized segment.

5. Capsular Management

Once the subscapularis is mobilized, the underlying anterior capsule is exposed.
* Capsulotomy: An incision is made in the anterior capsule to gain access to the glenohumeral joint.
* T-Capsulotomy: A common approach, involving a vertical incision in the capsule and a horizontal extension superiorly and inferiorly, forming a "T" shape. This allows for excellent exposure and controlled closure.
* Straight Vertical Capsulotomy: A simple longitudinal incision.
* Inverted T-Capsulotomy: Less common.
* Capsular Release: Depending on the procedure (e.g., adhesive capsulitis), further capsular releases may be performed to improve mobility. Care must be taken posteriorly to avoid damage to the posterior neurovascular structures.

6. Specific Maneuvers / Reduction / Fixation (Procedure-Dependent)

For Proximal Humerus Fractures (ORIF)

• Exposure: The deltopectoral interval is developed, and the deltoid is gently retracted. The fracture hematoma is cleared.
• Reduction: Direct visualization and manipulation, often using sutures through rotator cuff tendons, cerclage wires, or specialized fracture reduction clamps. Fluoroscopy assists in confirming reduction.
• Fixation: Locking plates are commonly used, applied to the lateral aspect of the humerus, distal to the greater tuberosity. Screws are inserted, paying careful attention to humeral head height, varus/valgus alignment, and avoiding intra-articular screw penetration. The axillary nerve is at risk distally.

For Arthroplasty (TSA, Hemi, RTSA)

• Humeral Head Resection: The humeral head is resected at the anatomical neck, typically using an oscillating saw.
• Glenoid Preparation (TSA/RTSA): The humeral head is dislocated, and the glenoid is exposed.
  • TSA: The glenoid articular cartilage is reamed, and the glenoid component is implanted, usually cemented.
  • RTSA: The glenoid is reamed for the baseplate, and the glenosphere is secured.
• Humeral Stem Implantation: The humeral canal is prepared with reamers and broaches. The humeral stem (cemented or uncemented) is implanted, and the humeral head component or articular liner is attached.
• Soft Tissue Balancing: Important for optimizing range of motion and stability.

For Instability (Bankart, Latarjet)

• Labral Repair (Bankart): The anterior labrum is mobilized. Suture anchors are placed into the anterior glenoid rim, and sutures are passed through the avulsed labrum and capsule to reattach them to the glenoid, restoring the anterior bumper.
• Latarjet Procedure:
  • The coracoid process, with its attached conjoined tendon, is osteotomized.
  • The pectoralis minor is detached from the coracoid.
  • The coracoid transfer is rotated and fixed to the anterior glenoid neck using screws, providing a bony block and sling effect from the conjoined tendon.

7. Wound Closure

• Capsule Repair: The anterior capsule is carefully repaired, typically with absorbable sutures, to restore glenohumeral stability and prevent postoperative subluxation.
• Subscapularis Repair: Crucial for shoulder function. The subscapularis tendon is reattached to the lesser tuberosity with strong, non-absorbable sutures, often using a transosseous or suture anchor technique. The tension of the repair is important to prevent stiffness or recurrent instability.
• Deltopectoral Interval: The interval is loosely approximated, ensuring no muscle entrapment.
• Subcutaneous Layer: Closed with absorbable sutures.
• Skin Closure: Closed with staples or absorbable/non-absorbable sutures.
• Drains: A suction drain may be placed deep to the deltoid, particularly after arthroplasty or complex trauma, to manage hematoma. It is typically removed within 24-48 hours.

Complications & Management

Despite its safety and efficacy, the deltopectoral approach is not without potential complications. Awareness of these and strategies for management are crucial.

| Complication | Incidence | Salvage / Management Strategy ```

The## Introduction & Epidemiology

The deltopectoral approach is unequivocally the most versatile and frequently utilized anterior surgical corridor to the glenohumeral joint, proximal humerus, and surrounding periscapular region. Its elegance lies in exploiting a natural internervous plane, thereby preserving the integrity and function of the primary shoulder abductor, the deltoid muscle. This approach has evolved significantly since its detailed descriptions by Henry in "Extensile Exposure," becoming a foundational technique for a vast array of orthopedic interventions.

From an epidemiological perspective, the pathologies addressed through the deltopectoral approach represent a substantial burden on healthcare systems globally. Proximal humerus fractures, a common indication, constitute approximately 5-6% of all fractures, displaying a bimodal age distribution: high-energy trauma in younger individuals and low-energy osteoporotic fractures in the elderly. The incidence of these fractures, particularly in the aging population, is projected to rise with increasing life expectancy. Glenohumeral osteoarthritis, another major indication for arthroplasty via this approach, affects a significant proportion of individuals over 60 years of age, with symptomatic progression necessitating surgical intervention in hundreds of thousands annually worldwide. Anterior glenohumeral instability, frequently observed in active young adults and athletes, often mandates open stabilization procedures such as Bankart repairs or Latarjet transfers when non-operative measures fail or bone loss is significant. Furthermore, complex rotator cuff pathologies, particularly large or retracted subscapularis tears, are increasingly managed via this direct anatomical route. The enduring relevance of the deltopectoral approach stems from its robust evidence base, enabling predictable access and superior patient outcomes across this spectrum of conditions.

Surgical Anatomy & Biomechanics

A profound understanding of the intricate three-dimensional anatomy and underlying biomechanical principles is indispensable for the safe, efficient, and successful execution of the deltopectoral approach. This dissection plane respects vital neurovascular structures, thereby minimizing iatrogenic injury and facilitating optimal post-operative function.

Surface Anatomy

Key palpable surface landmarks include:
* Clavicle: Superior boundary.
* Acromion: Lateral superior reference point.
* Coracoid Process: Approximately 2.5 cm inferior to the junction of the middle and lateral thirds of the clavicle; a critical bony reference for the superior extent of the incision and identification of the conjoined tendon.
* Deltopectoral Groove: The visible or palpable sulcus between the deltoid and pectoralis major muscles, indicating the desired internervous plane.

Superficial Anatomy

The initial dissection proceeds through:
* Skin: The incision is typically curvilinear, initiating 2-3 cm inferior to the coracoid process and extending distally along the deltopectoral groove for 8-15 cm, dictated by the extent of required exposure.
* Subcutaneous Fat: This layer is incised, revealing the investing fascia. Minor superficial veins and cutaneous nerves (e.g., branches of the supraclavicular nerve) may be encountered and should be managed with cauterization or ligation.

Deep Anatomy

The Deltopectoral Interval

This is the primary internervous plane.
* Deltoid Muscle (Lateral): Originates from the lateral third of the clavicle, the acromion, and the spine of the scapula. It inserts onto the deltoid tuberosity of the humerus. Innervated by the axillary nerve (C5, C6) . Its integrity is paramount for shoulder abduction and flexion.
* Pectoralis Major Muscle (Medial): Originates from the medial half of the clavicle, the sternum, costal cartilages 2-6, and the aponeurosis of the external oblique. It inserts onto the lateral lip of the bicipital groove of the humerus. Innervated by the medial (C8, T1) and lateral (C5-C7) pectoral nerves .
* Cephalic Vein: The most consistent superficial landmark within the deltopectoral groove. It courses superiorly to enter the axillary vein within the clavipectoral fascia, below the clavicle.
* Management: Typically, the cephalic vein is carefully isolated and retracted medially with the pectoralis major. This preserves its integrity and prevents kinking, which can lead to venous congestion and post-operative swelling. Lateral retraction with the deltoid places it at risk of injury from retractors and potentially obscures the axillary nerve. Ligation is an option if retraction is inadequate or if the vein is inadvertently injured, but it should be a last resort.
* Deltoid Branch of the Thoracoacromial Artery: A small but consistent artery accompanying the cephalic vein, originating from the thoracoacromial artery. It requires careful identification and cauterization/ligation to maintain hemostasis.

Structures Deep to the Deltopectoral Interval

After developing the deltopectoral interval, deeper structures become visible.
* Clavipectoral Fascia: A robust fascial sheet deep to the pectoralis major. It bridges from the clavicle to the axillary fascia, investing the pectoralis minor and subclavius muscles. This fascia is incised longitudinally, typically inferior to the clavicle and medial to the conjoined tendon, to expose the underlying structures. The deltoid branch of the thoracoacromial artery also pierces this fascia.
* Coracoid Process: A crucial bony landmark. It serves as the origin for the conjoined tendon (short head of the biceps brachii and coracobrachialis muscles) and the pectoralis minor muscle.
* Conjoined Tendon (Short Head of Biceps & Coracobrachialis): These muscles originate from the coracoid tip. The conjoined tendon is a key anatomical reference point and a major contributor to the anterior wall of the axilla.
* Musculocutaneous Nerve (C5-C7): This nerve typically enters the deep surface of the coracobrachialis muscle approximately 5-8 cm distal to the coracoid tip. Excessive or unmindful medial retraction or division of the conjoined tendon risks injury to this nerve.
* Pectoralis Minor Muscle: Located deep to the pectoralis major, originating from ribs 3-5 and inserting onto the coracoid process. It overlies the axillary neurovascular bundle.
* Axillary Neurovascular Bundle: Located medial and deep to the coracoid process and pectoralis minor. This critical bundle contains the axillary artery, axillary vein, and the cords of the brachial plexus (lateral, posterior, medial) . Extreme medial retraction of the conjoined tendon and pectoralis minor risks severe injury to these structures.
* Subscapularis Muscle and Tendon: The anterior component of the rotator cuff. It originates from the subscapular fossa and inserts onto the lesser tuberosity of the humerus. Innervated by the upper and lower subscapular nerves (C5-C7) , which arise directly from the posterior cord of the brachial plexus and enter the deep surface of the muscle.
* Axillary Nerve (C5, C6) and Anterior Humeral Circumflex Artery: The axillary nerve, after exiting the quadrangular space, courses inferiorly and then anteriorly approximately 5-7 cm distal to the acromion, around the surgical neck of the humerus. It lies in close proximity to the inferior border of the subscapularis and the inferior glenohumeral joint capsule. The anterior humeral circumflex artery (a branch of the axillary artery) parallels the axillary nerve anteriorly. These structures are highly vulnerable during inferior capsular releases, humeral head resection, and subscapularis dissection or repair. A blunt retractor (e.g., Hohmann) placed under the inferior border of the subscapularis and anterior capsule is crucial for protection.

Biomechanics

The biomechanical rationale for the deltopectoral approach is rooted in its ability to preserve the functional integrity of the deltoid and, with careful management, the subscapularis.
* Deltoid Preservation: By dissecting through the internervous plane, the deltoid origin, insertion, and innervation are maintained, minimizing post-operative weakness and facilitating robust early rehabilitation. This is in contrast to deltoid-splitting approaches which can compromise deltoid function.
* Capsular Management: The anterior capsule is a primary static stabilizer. Its controlled incision and meticulous repair are essential to restore static stability and prevent iatrogenic instability or excessive stiffness.
* Subscapularis Integrity: The subscapularis is a powerful internal rotator and anterior stabilizer. The chosen method of management (tenotomy vs. peel) and subsequent repair significantly influence post-operative internal rotation strength and anterior stability. Improper repair or excessive mobilization can lead to subscapularis insufficiency, anterior subluxation, or failure of repair.
* Neurovascular Protection: Understanding the spatial relationships of the axillary nerve, musculocutaneous nerve, and the axillary vessels is paramount. Excessive or uncontrolled retraction can lead to neurapraxia or more severe nerve injury, resulting in permanent weakness or sensory deficits.

Indications & Contraindications

The deltopectoral approach is a highly adaptable pathway for a broad spectrum of shoulder pathologies. The decision to employ this approach is predicated on a careful assessment of the patient's condition, pathology, and surgical goals.

Indications

Operative Indications (Primary Use of Deltopectoral Approach)

1. Proximal Humerus Fractures:

   • Open Reduction Internal Fixation (ORIF): For displaced 2-, 3-, and 4-part fractures (e.g., Neer classification) that are amenable to anatomical reduction and stable fixation with locking plates, intramedullary nails (though less common for deltopectoral access), or other constructs. This approach provides excellent visualization of the tuberosities and articular surface.
   • Arthroplasty for Fractures: Hemiarthroplasty or reverse total shoulder arthroplasty (RTSA) for highly comminuted, head-splitting, or osteoporotic fractures, particularly in elderly patients with poor bone quality where ORIF is unlikely to succeed.

2. Glenohumeral Arthroplasty:

   • Total Shoulder Arthroplasty (TSA): The gold standard for primary glenohumeral osteoarthritis, rheumatoid arthritis, post-traumatic arthritis, or osteonecrosis. Allows for meticulous glenoid preparation and component placement.
   • Hemiarthroplasty: Used when the glenoid is relatively preserved or in specific fracture patterns.
   • Reverse Total Shoulder Arthroplasty (RTSA): Increasingly common for rotator cuff tear arthropathy, failed conventional TSA, or complex proximal humerus fractures. While primarily deltopectoral, it often requires superior extension to adequately expose the superior glenoid.

3. Anterior Glenohumeral Instability:

   • Bankart Repair: Open anatomical repair of the avulsed anterior inferior labrum and capsule to the glenoid rim, particularly for failed arthroscopic repairs or when significant capsular laxity exists.
   • Capsular Shift/Plication: For multidirectional instability or generalized capsular laxity.
   • Latarjet Procedure (Coracoid Transfer): For recurrent anterior instability with significant anterior glenoid bone loss (>20-25%), engaging Hill-Sachs lesions, or failed previous soft tissue repairs. The deltopectoral approach provides direct access for coracoid osteotomy, transfer, and fixation.

4. Rotator Cuff Repair:

   • Subscapularis Tear Repair: The preferred approach for isolated or complex subscapularis tears that require direct visualization and repair.

5. Acromioclavicular (AC) Joint Reconstruction:

   • For chronic, symptomatic high-grade AC joint dislocations (e.g., Rockwood Type III-VI) requiring ligament reconstruction or transfer (e.g., Weaver-Dunn, allograft reconstruction). Provides access to the conoid and trapezoid ligaments.

6. Tumor Resection:

   • Biopsy or resection of benign or malignant tumors of the proximal humerus, glenoid, or scapular neck. Offers extensile exposure for oncologic margins.

7. Infection:

   • Debridement and irrigation of septic arthritis of the glenohumeral joint or osteomyelitis of the proximal humerus, especially when open access for thorough debridement is required.

8. Hardware Removal:

   • Extraction of previously placed implants (plates, screws, intramedullary nails) in the proximal humerus.

9. Glenoid Fractures:

   • Open reduction and internal fixation of displaced articular or neck fractures of the glenoid (e.g., anterior rim fractures, specific Ideberg types).

Contraindications

1. Active Infection: Absolute contraindication to elective procedures. In cases of acute septic arthritis, open irrigation and debridement via this approach may be indicated, but with appropriate antibiotic coverage.
2. Extensive Scarring/Disrupted Anatomy: Severe scarring from previous surgeries or significant traumatic disruption of the deltopectoral interval can make identification and safe dissection of the plane extremely challenging, increasing the risk of iatrogenic injury to neurovascular structures.
3. Severe Axillary Nerve Palsy: While not always an absolute contraindication, if the deltoid is already significantly compromised, preserving any residual function by avoiding excessive retraction or specific nerve-vulnerable maneuvers becomes paramount. Alternative approaches that do not stress the deltoid might be considered for specific pathologies.
4. Pathology Requiring Posterior Access: Conditions like posterior glenoid fractures, posterior instability, or posterior rotator cuff tears are definitively better managed via a posterior approach.
5. Lack of Surgeon Familiarity/Experience: Like any surgical approach, it should only be undertaken by surgeons proficient in its anatomical nuances and technical execution.

Operative vs. Non-Operative Indications Table

Pre-Operative Planning & Patient Positioning

Meticulous pre-operative planning and precise patient positioning are non-negotiable prerequisites for the safe and efficient execution of the deltopectoral approach, maximizing exposure while mitigating potential complications.

Pre-Operative Planning

1. Comprehensive Patient Evaluation:
   • History & Physical Examination: Detailed assessment of pain, range of motion, strength, neurovascular status, and functional limitations. Special attention to any prior surgeries, scars, or potential anatomical variants.
   • Comorbidities: Evaluate systemic health, especially cardiovascular and pulmonary status, which may influence anesthetic choice and post-operative recovery. Identify potential risk factors for infection, DVT, or impaired wound healing.
2. Advanced Imaging Review:
   • Plain Radiographs: Standard anteroposterior (AP), true AP (Grashey), scapular Y, and axillary views are fundamental. For trauma, additional views (e.g., Velpeau, transthoracic lateral) may be useful.
   • Computed Tomography (CT) Scan: Essential for complex fracture patterns (e.g., 3D reconstructions to assess comminution, articular extension, glenoid involvement, humeral head impaction). For arthroplasty, CT with 3D reconstruction is crucial for assessing glenoid version, retroversion, erosion, and bone stock, guiding implant sizing and positioning.
   • Magnetic Resonance Imaging (MRI): Indispensable for evaluating soft tissue pathology, including rotator cuff tears (especially subscapularis), labral injuries (Bankart, SLAP), capsular integrity, and articular cartilage status, particularly in cases of instability or planning for soft tissue repair.
3. Surgical Strategy Elaboration:
   • Procedure-Specific Details: Define the exact operative plan (e.g., type of fixation for a fracture, specific arthroplasty components, technique for instability repair).
   • Anticipated Challenges: Identify potential intraoperative difficulties based on imaging (e.g., severe deformity, bone loss, previous hardware, scar tissue) and formulate contingency plans.
   • Implant Selection: Meticulous templating for arthroplasty (humeral head size, stem length, glenoid component size/peg length) and selection of appropriate plates, screws, or anchors for fixation.
4. Informed Consent: Beyond the generic surgical risks, specifically discuss risks pertinent to the deltopectoral approach: potential for neurovascular injury (axillary nerve, musculocutaneous nerve, cephalic vein), infection, stiffness, pain, implant failure, and the expected rehabilitation trajectory.
5. Anesthesia Consultation: Confirm patient fitness for general anesthesia. Discussion of regional anesthesia (e.g., interscalene brachial plexus block) for superior peri-operative pain management and reduction of opioid consumption.

Patient Positioning

The choice of patient position significantly impacts surgical exposure, ergonomics, and patient safety. The two primary positions are the beach chair and supine.

1. Beach Chair Position (Most Common)

• Description: The patient is placed in a semi-recumbent position, typically with the torso elevated 30-70 degrees from horizontal.
• Advantages:
  • Optimal Ergonomics: Allows the surgeon to operate from above the shoulder, providing a natural, comfortable working posture and excellent visualization into the glenohumeral joint.
  • Gravity-Assisted Exposure: The humerus naturally falls away from the glenoid, aiding in joint distraction and exposure, particularly useful for arthroplasty and glenoid work.
  • Reduced Blood Loss: Lower extremity venous pooling and reduced hydrostatic pressure in the upper extremity can contribute to a drier surgical field when combined with controlled hypotension.
  • Flexibility: Allows for easy manipulation of the arm throughout its range of motion.
• Disadvantages:
  • Risk of Cerebral Hypoperfusion: Requires meticulous monitoring of blood pressure, ensuring adequate cerebral perfusion pressure.
  • Potential for Air Embolism: A rare but potentially catastrophic complication due to open venous sinuses in an elevated position.
  • Positioning-Related Nerve Injuries: Careful attention to neck and limb padding is crucial to prevent brachial plexus, ulnar, or sciatic nerve palsies.
• Setup Protocol:
  1. Operating Table Adjustment: Articulate the table to achieve the desired torso elevation.
  2. Head & Neck Positioning: The head is secured in a headrest (e.g., Mayfield or doughnut pillow) with the neck in a neutral position, slightly flexed, and rotated 15-20 degrees away from the operative side. Ensure careful padding of the ears and occiput. Confirm no excessive lateral flexion or rotation to avoid brachial plexus stretch.
  3. Torso Support: Chest straps are applied across the torso to prevent movement and ensure patient stability on the table.
  4. Lower Extremity Positioning: Hips and knees are slightly flexed (approximately 30 degrees), with adequate padding under the heels and calves to prevent pressure points.
  5. Non-Operative Arm: Padded and tucked securely at the patient's side, ensuring no pressure on the ulnar nerve at the elbow.
  6. Operative Arm Preparation: The arm is prepared and draped free (with a sterile stockinette or impervious sleeve) to allow for full intraoperative manipulation and range of motion assessment. An assistant or arm holder typically manages the arm.

2. Supine Position (Less Common for Elective DP)

• Description: The patient lies flat on their back.
• Advantages:
  • Hemodynamic Stability: Reduced risk of cerebral hypoperfusion.
  • C-arm Accessibility: Easier and more stable positioning of a C-arm for fluoroscopic guidance, particularly beneficial for complex trauma.
  • Patient Transport: Simpler for critically ill or polytrauma patients requiring multiple access points or less movement.
• Disadvantages:
  • Gravity Works Against Exposure: May require more vigorous and sustained retraction, potentially increasing soft tissue injury. Dislocating the humeral head for glenoid exposure can be more challenging.
  • Suboptimal Ergonomics: The surgeon may need to lean or operate from a less comfortable angle.
• Setup Protocol:
  1. Operating Table: Flat.
  2. Shoulder Bump: A small, firm bump or rolled towel is placed under the ipsilateral scapula to protract the shoulder anteriorly, improving access to the glenoid.
  3. Head & Neck: Neutral position, supported by a soft pillow.
  4. Arms: Both arms are typically abducted on arm boards (e.g., 45-90 degrees) with careful padding, ensuring the ulnar nerves are protected. The operative arm is prepped and draped free.

Instrumentation & Equipment

Beyond standard surgical trays, specific items enhance the deltopectoral approach:
* Retractors: Broad selection including Army-Navy, Hohmann (various sizes, sharp/blunt), Darrach, Langenbeck, and self-retaining retractors (e.g., Weitlaner, Omni-Tract, Hibbs).
* Electrocautery: Bipolar and monopolar for precise hemostasis and dissection.
* Sutures: A range of absorbable and non-absorbable sutures for deep tissue repair (subscapularis, capsule) and wound closure.
* Periosteal Elevators: Freer or curved elevators for subperiosteal dissection.
* Bone Hooks/Clamps: For reduction and manipulation of bone fragments or the humeral head.
* Implants: Procedure-specific (e.g., locking plates and screws, suture anchors, shoulder arthroplasty components, coracoid screws).
* Irrigation/Suction: Constant irrigation to maintain a clear field, pulsed lavage for debridement in arthroplasty.

Antibiotic Prophylaxis & Regional Anesthesia

• Antibiotic Prophylaxis: Administer intravenous broad-spectrum antibiotics (e.g., cefazolin 2g) within 60 minutes prior to incision, with re-dosing for prolonged cases as per institutional guidelines.
• Regional Anesthesia: An interscalene brachial plexus block, performed pre-operatively, is highly recommended. It provides excellent post-operative analgesia, reduces intraoperative anesthetic requirements, and facilitates earlier initiation of rehabilitation.

Detailed Surgical Approach / Technique

The detailed surgical technique for the deltopectoral approach emphasizes meticulous dissection, precise identification of anatomical landmarks, and careful protection of neurovascular structures. The specific steps involved in reduction and fixation vary significantly based on the pathology, but the initial exposure remains largely consistent.

1. Skin Incision and Subcutaneous Dissection

• Skin Incision: A curvilinear skin incision is made, starting just inferior to the tip of the coracoid process (approximately 2 cm distal and 2 cm medial). The incision then extends distally along the natural sulcus between the deltoid and pectoralis major muscles for 8-15 cm, depending on the required exposure. For arthroplasty or complex fracture cases, a longer incision might be necessary.
• Subcutaneous Dissection: The incision is deepened through the subcutaneous fat using a scalpel or electrocautery. Superficial veins (if any) are ligated or cauterized. Minor cutaneous nerves may be encountered and, if possible, preserved.

2. Identification and Development of the Deltopectoral Interval

• Landmark Identification: The distinct borders of the pectoralis major muscle (medially) and the deltoid muscle (laterally) are identified. The deltopectoral groove typically lies directly between these two muscles.
• Cephalic Vein Management: The cephalic vein is the consistent landmark in this interval. It is carefully identified and isolated.
  • Medial Retraction (Preferred): The vein is gently dissected free from the surrounding fascia and retracted medially along with the pectoralis major. This minimizes the risk of injury to the axillary nerve which lies laterally and avoids kinking or damage to the vein against the deltoid. Small branches entering the cephalic vein must be ligated or cauterized.
  • Ligation: If the cephalic vein is small, obstructive, or accidentally transected, it can be ligated at both ends. However, preservation is always preferred to prevent post-operative arm swelling.
• Developing the Interval: The loose areolar tissue within the deltopectoral interval is bluntly and sharply dissected, separating the deltoid from the pectoralis major. This plane is relatively avascular once the cephalic vein and its tributaries are managed. Retractors (e.g., Army-Navy) are placed to maintain the separation.

3. Deep Dissection and Exposure of the Coracoid

• Clavipectoral Fascia Incision: Deep to the pectoralis major, the dense clavipectoral fascia is encountered. It bridges from the clavicle to the axillary fascia, investing the pectoralis minor and subclavius. This fascia is incised longitudinally along the medial border of the conjoined tendon (coracobrachialis and short head of biceps). This incision should be carried superiorly, but avoid excessive dissection under the clavicle where the thoracoacromial artery and cords of the brachial plexus lie.
• Coracoid Process and Conjoined Tendon Exposure: Incising the clavipectoral fascia exposes the coracoid process and the conjoined tendon (short head of biceps and coracobrachialis) originating from its tip. The pectoralis minor muscle, inserting onto the coracoid, lies deep to the pectoralis major.
• Conjoined Tendon Retraction: The conjoined tendon is a critical structure. For most procedures requiring glenohumeral joint access, it is retracted medially.
  • Caution: Extreme or forceful medial retraction places the musculocutaneous nerve (entering the coracobrachialis 5-8 cm distal to the coracoid) and the underlying axillary neurovascular bundle (artery, vein, brachial plexus cords) at high risk. Gentle, broad-based retraction is paramount. Placing a wide, blunt retractor deep to the conjoined tendon helps protect these structures.
• Exposure of Subscapularis: With the conjoined tendon retracted medially, the anterior capsule of the glenohumeral joint and the underlying subscapularis muscle and tendon are brought into view.

4. Management of the Subscapularis and Capsule

This step is highly dependent on the pathology being addressed.

a. For Arthroplasty (TSA, Hemi, RTSA) and Complex Fractures

• Identification of Axillary Nerve: Before incising the subscapularis, palpate the inferior border of the muscle. Place a blunt Hohmann retractor beneath this inferior border, carefully sweeping superiorly and inferiorly, to identify and protect the axillary nerve and anterior humeral circumflex artery as they cross the surgical neck of the humerus. This is a critical step.
• Subscapularis Tenotomy: This is the standard method for arthroplasty.
  • The subscapularis tendon is sharply divided from its insertion on the lesser tuberosity. The cut is typically made 1-1.5 cm medial to its insertion.
  • Stay sutures (e.g., #2 Fiberwire) are placed in the free edge of the tendon to facilitate retraction and later repair.
  • The muscle belly is mobilized from the anterior capsule and humeral neck, allowing it to be retracted medially.
• Capsulotomy: Once the subscapularis is retracted, the anterior capsule is exposed. A "T-capsulotomy" is commonly performed, with a vertical limb along the anterior humeral neck and horizontal limbs superiorly and inferiorly. The inferior limb must be carefully performed to avoid injuring the axillary nerve. This provides excellent exposure of the glenohumeral joint.
• Lesser Tuberosity Osteotomy (Alternative): In specific cases (e.g., revision surgery, poor subscapularis quality), a small osteotomy of the lesser tuberosity with the subscapularis tendon attached can be performed. This allows for bone-to-bone healing upon repair but carries the risk of non-union or avulsion. This is generally less common for primary arthroplasty than tenotomy.

b. For Instability (Bankart Repair, Latarjet Procedure)

• Subscapularis Peel (Capsular-Subscapularis Release): For Bankart repair, the subscapularis muscle and anterior capsule are often elevated together as a single layer from the anterior glenoid rim and humeral neck. This preserves the tendon length and nerve supply.
  • A scalpel is used to incise the capsule directly on the anterior glenoid rim, then a periosteal elevator reflects the labrum, capsule, and subscapularis off the glenoid and medial humeral neck.
• Capsular Plication/Shift: For capsular laxity, the anterior capsule can be incised, overlapped, and re-sutured to tighten the redundant tissue.
• Latarjet Procedure Specifics:
  • After exposing the coracoid, the pectoralis minor tendon is released from its insertion on the coracoid.
  • The coracoid is osteotomized (typically 2 cm distal to its tip) using an oscillating saw, preserving the conjoined tendon insertion.
  • The transferred coracoid block is then mobilized and fixed to the anterior glenoid neck using two screws, creating a bony buttress and a sling effect from the conjoined tendon.

5. Intra-Articular Maneuvers / Reduction / Fixation (Procedure-Dependent)

For Proximal Humerus Fracture Fixation

• Reduction: The fracture hematoma is evacuated. Direct visualization allows for anatomical reduction of the humeral head and tuberosities. Suture passers, cerclage wires, or specialized reduction clamps are used to manipulate fragments. The arm is often positioned in slight abduction and external rotation to facilitate tuberosity reduction. Fluoroscopy confirms reduction.
• Plate Application: A locking plate is typically applied to the lateral aspect of the humerus, slightly distal to the greater tuberosity. The plate position must avoid impingement and protect the rotator cuff. Screws are inserted, paying critical attention to length, direction, and avoiding intra-articular penetration. Lag screws across fracture lines further enhance stability.

For Shoulder Arthroplasty

• Humeral Head Resection: The humeral head is delivered into the wound. An oscillating saw, guided by specific cutting guides, resects the humeral head at the anatomical neck. The cut should be based on templating and intraoperative assessment to restore appropriate humeral version and height.
• Humeral Canal Preparation: The humeral canal is prepared using reamers and broaches, sized to accept the chosen prosthetic stem (cemented or uncemented).
• Glenoid Preparation (TSA/RTSA): The humeral head is dislocated (or removed). A glenoid retractor is placed. The glenoid articular cartilage is débrided.
  • TSA: The glenoid is reamed to prepare for the glenoid component, which is typically cemented or press-fit (less common).
  • RTSA: The glenoid is prepared for a baseplate, which is secured with screws, followed by placement of the glenosphere.
• Component Implantation: The humeral stem and head components (or sphere for RTSA) are implanted. For TSA, the glenoid component is then inserted. For RTSA, the glenosphere is attached.
• Soft Tissue Balancing: Important for optimizing range of motion, stability, and implant function. Assessment of joint stability and range of motion is performed before closure.

6. Wound Closure

• Capsule Repair: The anterior capsule is meticulously repaired using strong, absorbable sutures. For instability cases, the capsule may be plicated or overlapped to reinforce stability.
• Subscapularis Repair: This is a critical step for restoring shoulder function and stability.
  • For tenotomy, the subscapularis tendon is reattached to its insertion site on the lesser tuberosity using strong, non-absorbable sutures (e.g., #2 Fiberwire) in a transosseous, transosseous-equivalent, or suture anchor technique. The repair must be secure and at appropriate tension to allow for healing and restore internal rotation strength.
  • For lesser tuberosity osteotomy, the bone block is reattached with screws or sutures.
• Deltopectoral Interval Re-approximation: The deltopectoral interval is loosely approximated using absorbable sutures. Avoid tight closure that could cause muscle strangulation.
• Subcutaneous Layer: Closed with interrupted absorbable sutures.
• Skin Closure: Closed with staples or subcuticular absorbable sutures.
• Drain Placement: A suction drain (e.g., Hemovac) may be placed deep to the deltoid, particularly in arthroplasty or complex trauma, to prevent hematoma formation. It is typically removed within 24-48 hours.
• Dressing and Immobilization: A sterile dressing is applied, and the arm is placed in a sling or abduction brace, as per post-operative protocol.

Complications & Management

While the deltopectoral approach is generally safe and reliable, complications can arise. Recognition and appropriate management are crucial for optimal patient outcomes.

| Complication | Incidence | Salvage / Management Strategy Deltopectoral Approach: Comprehensive Guide to the Deltopectoral

Introduction & Epidemiology

The deltopectoral approach is the cornerstone anterior surgical pathway to the glenohumeral joint, proximal humerus, and periscapular region. Its enduring popularity stems from its reliable access, robust extensibility, and minimal disruption of critical muscle groups. Historically, various anterior approaches to the shoulder have been described, but the deltopectoral interval, due to its natural internervous plane, has emerged as the most widely adopted and refined. Henry’s classic anatomical descriptions laid the groundwork, and subsequent advancements in instrumentation and understanding of shoulder biomechanics have solidified its status as a fundamental technique in orthopedic surgery.

Epidemiologically, the conditions managed via the deltopectoral approach represent a significant and growing surgical volume. Proximal humerus fractures are a prime indication, accounting for approximately 5-6% of all fractures, with an increasing incidence in the elderly population driven by osteoporosis and demographic shifts. These fractures frequently necessitate open reduction and internal fixation (ORIF) or arthroplasty. Glenohumeral osteoarthritis, both primary and post-traumatic, leads to substantial pain and disability, with total shoulder arthroplasty (TSA) or hemiarthroplasty being definitive interventions often performed through this route. The demand for these arthroplasty procedures continues to rise, especially with the expansion of indications for reverse total shoulder arthroplasty (RTSA). Anterior glenohumeral instability, particularly in young, active individuals and athletes, frequently requires open stabilization procedures such as Bankart repair or the Latarjet procedure, for which the deltopectoral approach offers direct anatomical access. Complex rotator cuff tears, particularly those involving the subscapularis tendon, also benefit from the direct visualization afforded by this approach. The high prevalence of these pathologies underscores the continuous necessity for comprehensive mastery of the deltopectoral approach.

Surgical Anatomy & Biomechanics

A profound understanding of the nuanced anatomy within and surrounding the deltopectoral interval, along with the biomechanical implications of its dissection, is paramount for minimizing iatrogenic injury and optimizing functional outcomes. This approach respects the crucial internervous plane between the deltoid and pectoralis major muscles.

Surface Anatomy

Key palpable landmarks that guide the skin incision and initial dissection include:
* Clavicle: The superior border of the surgical field.
* Acromion: The lateral extension of the scapular spine.
* Coracoid Process: Approximately 2.5-3 cm inferior and medial to the acromial angle. It serves as a superior reference point for the incision and a key attachment site for numerous muscles and ligaments.
* Deltopectoral Groove: The often visible or palpable sulcus separating the deltoid (laterally) from the pectoralis major (medially).

Superficial Anatomy

• Skin Incision: Typically curvilinear, initiated 2-3 cm distal and medial to the coracoid tip, extending inferiorly along the deltopectoral groove. Its length (8-15 cm) is tailored to the specific procedure, with arthroplasty often requiring a more extensive exposure.
• Subcutaneous Tissue: Dissection through this layer reveals the investing fascia and, most notably, the cephalic vein. Minor superficial veins and cutaneous nerve branches (e.g., from the supraclavicular nerve) may be encountered and require careful management.

Deep Anatomy

The Deltopectoral Interval: The Internervous Plane

This critical plane is the gateway to the shoulder joint.
* Deltoid Muscle (Lateral): Originates from the lateral third of the clavicle, acromion, and scapular spine. It inserts onto the deltoid tuberosity of the humerus. It is innervated by the axillary nerve (C5, C6) . Preservation of this nerve and the muscle’s origin and insertion is fundamental for post-operative shoulder abduction and flexion.
* Pectoralis Major Muscle (Medial): Originates from the medial clavicle, sternum, and upper costal cartilages. It inserts onto the lateral lip of the bicipital groove. It is innervated by the medial (C8, T1) and lateral (C5-C7) pectoral nerves .
* Cephalic Vein: The most consistent and crucial landmark within the deltopectoral groove. It ascends from the arm to pierce the clavipectoral fascia and drain into the axillary vein.
* Management: The cephalic vein is typically identified early, carefully dissected free from its surrounding areolar tissue, and gently retracted medially with the pectoralis major. This minimizes the risk of injury from retractors against the deltoid and protects the axillary nerve, which lies laterally. If retraction is inadequate or the vein is compromised, ligation may be necessary, but it should be avoided if possible to mitigate post-operative venous congestion and swelling.
* Deltoid Branch of the Thoracoacromial Artery: A small, consistent arterial branch accompanying the cephalic vein. It often requires cauterization or ligation during dissection of the interval.

Deep Structures Exposed After Interval Development

Once the deltoid and pectoralis major are separated, deeper fascial layers and muscular structures come into view.
* Clavipectoral Fascia: A strong fascial sheet lying deep to the pectoralis major, extending from the clavicle to the axillary fascia. It invests the pectoralis minor and subclavius. An incision is made in this fascia, typically longitudinally and inferior to the clavicle, along the medial border of the conjoined tendon. This exposes the underlying structures and allows further medial retraction of the pectoralis major.
* Coracoid Process: A critical bony landmark, palpated superiorly in the wound. It is the origin for the conjoined tendon and the insertion for the pectoralis minor.
* Conjoined Tendon (Short Head of Biceps & Coracobrachialis): These muscles originate from the coracoid tip. The conjoined tendon forms part of the anterior wall of the axilla.
* Musculocutaneous Nerve (C5-C7): This nerve enters the deep surface of the coracobrachialis muscle approximately 5-8 cm distal to the coracoid tip. Extreme or uncontrolled medial retraction or tenotomy of the conjoined tendon poses a significant risk to this nerve.
* Pectoralis Minor Muscle: Lies deep to the pectoralis major, originating from ribs 3-5 and inserting onto the coracoid. It overlies the axillary neurovascular bundle.
* Axillary Neurovascular Bundle: Located medial and deep to the coracoid process and pectoralis minor. This vital bundle comprises the axillary artery, axillary vein, and the cords of the brachial plexus (lateral, posterior, medial) . Excessive or forceful medial retraction of the conjoined tendon and pectoralis minor can lead to catastrophic injury to these structures.
* Subscapularis Muscle and Tendon: The anterior rotator cuff muscle, originating from the subscapular fossa and inserting onto the lesser tuberosity of the humerus. It is a powerful internal rotator and anterior stabilizer. It is innervated by the upper and lower subscapular nerves (C5-C7) , which arise directly from the posterior cord and enter the deep surface of the muscle.
* Axillary Nerve (C5, C6) and Anterior Humeral Circumflex Artery: The axillary nerve, after traversing the quadrangular space, courses inferiorly and then anteriorly, approximately 5-7 cm distal to the acromion, around the surgical neck of the humerus. It runs in close proximity to the inferior border of the subscapularis muscle and the inferior glenohumeral joint capsule. The anterior humeral circumflex artery typically accompanies the nerve anteriorly. These structures are highly susceptible to injury during inferior capsular releases, humeral head resection, and subscapularis dissection or repair. Meticulous protection with a blunt Hohmann retractor beneath the inferior border of the subscapularis is essential.

Biomechanics

The biomechanical advantages of the deltopectoral approach are critical to post-operative function:
* Deltoid Preservation: Dissection along the internervous plane ensures the deltoid's origin, insertion, and innervation remain intact. This minimizes post-operative weakness in abduction and flexion, facilitating early and robust rehabilitation.
* Controlled Capsular Access: The anterior capsule, a primary static stabilizer, is intentionally incised. Its anatomical repair is vital to restore glenohumeral stability, prevent iatrogenic instability or excessive stiffness, and allow for appropriate tensioning.
* Subscapularis Function: The method of subscapularis management (tenotomy vs. peel) and the integrity of its repair are paramount. This muscle is a primary internal rotator and a critical anterior stabilizer. A failed or compromised subscapularis repair can lead to internal rotation weakness, anterior instability, or component subluxation in arthroplasty.
* Neurovascular Protection: The deliberate identification and protection of the axillary nerve, musculocutaneous nerve, and the axillary vessels are non-negotiable. Iatrogenic nerve injury can lead to debilitating muscle weakness, sensory loss, and significantly impair functional recovery.

Indications & Contraindications

The deltopectoral approach is highly versatile, serving as the standard pathway for numerous shoulder pathologies. The decision to utilize this approach hinges on the specific diagnosis, patient factors, and surgical objectives.

Indications

Operative Indications (Primary Use of Deltopectoral Approach)

1. Proximal Humerus Fractures:

   • Open Reduction Internal Fixation (ORIF): For displaced 2-part (e.g., surgical neck), 3-part (e.g., surgical neck with greater or lesser tuberosity), and 4-part fractures (e.g., Neer classification) that are amenable to anatomical reduction and stable internal fixation, typically with locking plates and screws. It provides excellent visualization of the tuberosities and articular surface crucial for precise reduction.
   • Arthroplasty for Fractures: Hemiarthroplasty or reverse total shoulder arthroplasty (RTSA) for highly comminuted, head-splitting fractures, or fractures with significant osteopenia in elderly patients where ORIF is unlikely to achieve durable fixation or an anatomical outcome.

2. Glenohumeral Arthroplasty:

   • Total Shoulder Arthroplasty (TSA): The gold standard for primary glenohumeral osteoarthritis, rheumatoid arthritis, post-traumatic arthritis, or osteonecrosis. It allows for meticulous preparation of both the humeral and glenoid components.
   • Hemiarthroplasty: Indicated when the glenoid articular surface is relatively preserved, often for avascular necrosis or specific fracture patterns.
   • Reverse Total Shoulder Arthroplasty (RTSA): Increasingly employed for rotator cuff tear arthropathy, complex proximal humerus fractures in the elderly, failed conventional TSA, or tumors. The deltopectoral approach, often with superior extension, is the standard.

3. Anterior Glenohumeral Instability:

   • Bankart Repair: Open anatomical repair of an avulsed anterior-inferior labrum and capsule to the glenoid rim, particularly for failed arthroscopic repairs, extensive soft tissue pathology, or significant capsular laxity.
   • Capsular Shift/Plication: For multidirectional instability or generalized capsular laxity, the approach allows for controlled tightening of the redundant capsule.
   • Latarjet Procedure (Coracoid Transfer): The procedure of choice for recurrent anterior instability associated with significant anterior glenoid bone loss (>20-25%), engaging Hill-Sachs lesions, or failed soft tissue repairs. The deltopectoral approach provides direct access for coracoid osteotomy, transfer, and fixation.

4. Rotator Cuff Repair:

   • Subscapularis Tear Repair: The preferred approach for isolated or complex subscapularis tears (full-thickness, retracted) that necessitate direct visualization for robust repair.
   • Massive Rotator Cuff Tears (certain patterns): In some instances, for large or complex tears, particularly those extending anteriorly, the deltopectoral approach can provide the necessary exposure for repair or reconstruction.

5. Acromioclavicular (AC) Joint Reconstruction:

   • For chronic, symptomatic high-grade AC joint dislocations (e.g., Rockwood Type III-VI) requiring reconstruction of coracoclavicular ligaments (e.g., using allograft or autograft with techniques like Weaver-Dunn modification). Provides access to the coracoid and clavicle.

6. Tumor Resection:

   • Biopsy or definitive surgical resection of benign or malignant tumors affecting the proximal humerus, glenoid, or scapular neck, where extensile exposure for oncologic margins is required.

7. Infection:

   • Open debridement and irrigation of septic arthritis of the glenohumeral joint or osteomyelitis of the proximal humerus, especially in cases of extensive purulence, biofilm formation, or bony involvement requiring thorough mechanical debridement.

8. Hardware Removal:

   • Extraction of previously implanted hardware (plates, screws, intramedullary nails) in the proximal humerus when symptoms or complications necessitate removal.

9. Glenoid Fractures:

   • Open reduction and internal fixation of displaced articular or neck fractures of the glenoid (e.g., certain anterior rim fractures, specific Ideberg types) requiring anatomical reduction and stable fixation.

Contraindications

1. Active Infection in the Surgical Field: An absolute contraindication for elective procedures. In acute septic arthritis, surgical debridement via this approach may be indicated, but only after initiation of appropriate systemic antibiotic therapy and with a clear goal of source control.
2. Extensive Scarring or Prior Surgical Disruption: Significant scarring from previous surgeries, radiation, or severe trauma can obliterate the deltopectoral interval, making safe dissection extremely challenging and increasing the risk of iatrogenic neurovascular injury. In such cases, alternative approaches or revision strategies should be considered.
3. Severe Axillary Nerve Palsy: While not always an absolute contraindication, if the deltoid is already significantly compromised by a pre-existing axillary nerve injury, preserving any remaining deltoid function is critical. The extensive retraction and manipulation inherent in the deltopectoral approach could potentially worsen an existing palsy. Alternative, less invasive or deltoid-sparing approaches might be favored for specific pathologies.
4. Pathology Primarily Located Posteriorly: Conditions such as posterior glenoid fractures, posterior glenohumeral instability, or isolated posterior rotator cuff tears are definitively better addressed via a posterior or postero-lateral approach, as the deltopectoral approach offers limited posterior visualization.
5. Uncontrolled Coagulopathy: Increases the risk of significant hematoma formation and bleeding complications.
6. Unacceptable Anesthetic Risk: Patients with severe comorbidities that preclude general or regional anesthesia.

Operative vs. Non-Operative Indications Table

Pre-Operative Planning & Patient Positioning

Meticulous pre-operative planning and precise patient positioning are critical for optimizing surgical exposure, minimizing intraoperative complications, and ensuring reproducible outcomes with the deltopectoral approach.

Pre-Operative Planning

1. Comprehensive Patient Assessment:
   • History and Physical Examination: A thorough history focusing on pain characteristics, functional limitations, previous shoulder interventions, and overall medical comorbidities is essential. The physical examination should assess active and passive range of motion, strength (especially rotator cuff integrity), stability, and neurovascular status. Documenting baseline nerve function is paramount.
   • Medical Optimization: Address any modifiable risk factors such as diabetes control, smoking cessation, and nutritional status. Ensure appropriate cardiac and pulmonary clearance for surgery.
2. Imaging Review and Templating:
   • Plain Radiographs: Standard true AP (Grashey), scapular Y, and axillary views are fundamental. For trauma, evaluate fracture patterns (Neer classification), displacement, and comminution. For arthroplasty, assess joint space narrowing, osteophyte formation, and any signs of glenoid erosion or osteopenia.
   • Computed Tomography (CT) Scan: Indispensable for complex pathologies. For fractures, 3D reconstructions are invaluable for assessing articular involvement, tuberosity displacement, and bone loss. For arthroplasty, CT with software-assisted templating is crucial for evaluating glenoid version, retroversion, erosion, and bone stock, which directly influences component selection and placement (especially for RTSA). For instability, CT quantifies glenoid bone loss and Hill-Sachs lesion size.
   • Magnetic Resonance Imaging (MRI): Essential for evaluating soft tissue structures. It delineates rotator cuff integrity (especially subscapularis tears), labral pathology (Bankart lesions), capsular status, and articular cartilage health. It is particularly valuable for instability cases, revision surgery, or when concomitant soft tissue pathology is suspected.
3. Surgical Strategy Elaboration:
   • Procedure Specifics: Clearly define the exact operative plan (e.g., plate type and number of screws for a fracture, specific arthroplasty components and fixation methods, detailed steps for instability repair like Latarjet transfer).
   • Anticipated Challenges and Contingency Plans: Identify potential intraoperative difficulties (e.g., severe deformity, extensive bone loss, revision surgery with prior hardware/scarring) based on imaging and clinical assessment. Formulate alternative strategies or identify necessary additional instrumentation.
   • Implant Selection and Templating: Meticulous pre-operative templating for arthroplasty helps predict humeral head size, stem length, and glenoid component dimensions, optimizing restoration of anatomy and soft tissue tension.
4. Informed Consent: Beyond standard surgical risks, specifically discuss risks pertinent to the deltopectoral approach and the planned procedure: potential for neurovascular injury (axillary nerve, musculocutaneous nerve, brachial plexus, axillary vessels, cephalic vein), infection, stiffness, pain, implant failure, and the expected rehabilitation trajectory.
5. Anesthesia Consultation: Confirm patient fitness for general anesthesia. Discuss the benefits of regional anesthesia (e.g., interscalene brachial plexus block) for superior peri-operative pain control, reduced opioid consumption, and facilitating early rehabilitation.

Patient Positioning

The choice of patient position significantly influences surgical exposure, ergonomics, and patient safety. The two primary positions for the deltopectoral approach are the beach chair position and the supine position.

1. Beach Chair Position (Most Common)

• Description: The patient is placed in a semi-recumbent position, with the torso elevated between 30 and 70 degrees from horizontal. This is the predominant position for arthroplasty and instability procedures.
• Advantages:
  • Optimal Surgical Ergonomics: Allows the surgeon to operate from above the shoulder, providing a comfortable working posture and excellent, unhindered visualization into the glenohumeral joint, particularly for glenoid preparation.
  • Gravity-Assisted Exposure: The arm hangs naturally, facilitating humeral head dislocation, glenoid visualization, and overall joint distraction, reducing the need for aggressive retraction.
  • Reduced Blood Loss: The semi-upright position can contribute to a drier surgical field due to lower extremity venous pooling and reduced hydrostatic pressure in the operative limb, especially when combined with controlled hypotensive anesthesia.
  • Unrestricted Arm Movement: The arm is draped free, allowing full intraoperative manipulation and assessment of range of motion and stability.
• Disadvantages:
  • Risk of Cerebral Hypoperfusion: Requires meticulous monitoring of blood pressure to ensure adequate cerebral perfusion pressure. Hypotension must be carefully managed.
  • Potential for Air Embolism: A rare but potentially catastrophic complication, particularly if open venous sinuses are present in an elevated position.
  • Positioning-Related Nerve Injuries: Careful attention to head, neck, and limb padding is crucial to prevent brachial plexus, ulnar nerve, or sciatic nerve palsies from stretch or compression.
• Setup Protocol:
  1. Operating Table Adjustment: The operating table is articulated to achieve the desired torso elevation. The patient's hips should be at the flexion point of the table.
  2. Head and Neck Positioning: The head is secured in a well-padded headrest (e.g., Mayfield or doughnut pillow) with the neck in a neutral position, slightly flexed, and rotated 15-20 degrees away from the operative shoulder. Ensure meticulous padding of the ears, eyes, and occiput. Verify that there is no excessive lateral flexion or rotation of the neck to prevent brachial plexus stretch.
  3. Torso Support: Chest straps are applied across the patient's torso to prevent migration and ensure stability on the table.
  4. Lower Extremity Positioning: Hips and knees are slightly flexed (approximately 30 degrees), with ample padding under the heels and calves to prevent pressure points.
  5. Non-Operative Arm: Padded and tucked securely at the patient's side, ensuring no pressure on the ulnar nerve at the elbow.
  6. Operative Arm Preparation: The operative arm is prepped and draped free (using a sterile stockinette or impervious sleeve) to allow unrestricted intraoperative manipulation, assessment of range of motion, and stability testing. An assistant or an articulating arm holder typically manages the arm.

2. Supine Position (Less Common for Elective Deltopectoral)

• Description: The patient is positioned flat on their back. This position may be preferred in specific scenarios, particularly for complex trauma or when extensive fluoroscopic guidance is anticipated.
• Advantages:
  • Hemodynamic Stability: Reduced risk of cerebral hypoperfusion compared to the beach chair position.
  • C-arm Accessibility: Easier and more stable positioning of a C-arm for fluoroscopic guidance, which is highly beneficial for complex fracture fixation.
  • Patient Transport: Simpler for critically ill or polytrauma patients who may require less movement or have other injuries necessitating supine positioning.
• Disadvantages:
  • Gravity Works Against Exposure: May require more vigorous and sustained retraction to achieve adequate glenohumeral joint exposure, potentially increasing soft tissue injury. Dislocating the humeral head for glenoid work can be more challenging.
  • Suboptimal Ergonomics: The surgeon may need to lean or operate from a less comfortable angle, potentially leading to increased fatigue during prolonged cases.
• Setup Protocol:
  1. Operating Table: The table is positioned flat.
  2. Shoulder Bump: A small, firm bump or rolled towel is placed longitudinally under the ipsilateral scapula to protract the shoulder anteriorly, improving access to the anterior glenoid.
  3. Head and Neck: Neutral position, supported by a soft pillow.
  4. Arms: Both arms are typically abducted on arm boards (e.g., 45-90 degrees) with meticulous padding, ensuring protection of the ulnar nerves at the elbows. The operative arm is prepped and draped free.

Instrumentation & Equipment

In addition to standard orthopedic surgical trays, specific instruments are essential:
* Retractors: A wide variety of retractors, including Army-Navy, Hohmann (sharp and blunt, various sizes), Darrach, Langenbeck, Fukuda, and self-retaining retractors (e.g., Weitlaner, Omni-Tract, Hibbs), are needed to maintain clear exposure.
* Electrocautery: Both monopolar and bipolar cautery for precise hemostasis and dissection.
* Sutures: A comprehensive range of absorbable (e.g., Vicryl) and non-absorbable (e.g., Fiberwire, Ethibond) sutures for deep tissue repair (subscapularis, capsule) and wound closure.
* Periosteal Elevators: Freer or curved elevators for subperiosteal dissection and tissue mobilization.
* Bone Hooks/Clamps: Essential for fracture reduction, manipulation of the humeral head, or temporary fixation.
* Implants: Procedure-specific implants, such as locking plates and screws, intramedullary nails, suture anchors, shoulder arthroplasty components (humeral stem, head, glenoid component/glenosphere, baseplate), coracoid screws for Latarjet.
* Irrigation/Suction: Constant irrigation to maintain a clear field; pulsed lavage for debridement in arthroplasty and infection cases.

Antibiotic Prophylaxis & Regional Anesthesia

• Antibiotic Prophylaxis: Intravenous broad-spectrum antibiotics (e.g., cefazolin 2g for adults) should be administered within 60 minutes prior to skin incision, with appropriate re-dosing for prolonged cases or significant blood loss, according to institutional guidelines. For penicillin-allergic patients, clindamycin or vancomycin can be used.
• Regional Anesthesia: An interscalene brachial plexus block, performed pre-operatively by the anesthesia team, is highly recommended. It provides superior post-operative analgesia, significantly reduces intraoperative anesthetic requirements, minimizes post-operative nausea and vomiting, and facilitates earlier and more comfortable initiation of rehabilitation.

Detailed Surgical Approach / Technique

The deltopectoral approach follows a structured, layered dissection to achieve safe and extensile access to the glenohumeral joint. Precision in each step, coupled with a thorough understanding of the underlying anatomy, is paramount.

1. Skin Incision and Subcutaneous Dissection

• Incision Planning: With the patient in the appropriate position (typically beach chair), identify the coracoid process, acromion, and the deltopectoral groove. Mark the skin incision: a curvilinear line commencing approximately 2 cm distal and 2 cm medial to the coracoid tip. The incision then extends distally along the natural deltopectoral groove for 8-15 cm, depending on the anticipated need for exposure (e.g., arthroplasty requires a longer incision than a simple Bankart repair).
• Initial Dissection: The incision is deepened through the skin and subcutaneous fat using a scalpel. Hemostasis is maintained with electrocautery. Any superficial veins (which are variable) are either ligated or cauterized. Minor cutaneous nerves encountered should be preserved if possible.

2. Identification and Development of the Deltopectoral Interval

• Muscle Identification: The distinct, vertically oriented fibers of the pectoralis major muscle (medially) and the more laterally oriented fibers of the deltoid muscle are identified. The natural cleavage plane between them is the deltopectoral groove.
• Cephalic Vein Management: The cephalic vein is the most reliable landmark within this interval.
  • It is carefully identified, dissected free from the surrounding areolar tissue, and gently mobilized.
  • Preferred Management: The cephalic vein is typically retracted medially along with the pectoralis major muscle. This minimizes the risk of injury to the axillary nerve (which lies laterally) and prevents kinking or compression of the vein against the deltoid. Small venous tributaries entering the cephalic vein must be ligated or carefully cauterized.
  • Ligation (If Necessary): If the vein is small, extensively adherent, or inadvertently damaged, it can be ligated proximally and distally. However, preserving the vein is always preferred to avoid post-operative arm swelling due to venous congestion.
• Developing the Plane: Using a combination of blunt (finger dissection) and sharp dissection (scalpel or electrocautery), the interval between the deltoid and pectoralis major is fully developed. Retractors (e.g., Army-Navy) are used to maintain the separation. This plane is relatively avascular once the cephalic vein and its branches are managed.

3. Deep Dissection and Exposure of the Coracoid and Conjoined Tendon

• Clavipectoral Fascia: Deep to the pectoralis major muscle, the dense clavipectoral fascia is encountered. This strong fascial layer covers the pectoralis minor and extends to the coracoid process.
  • Incision: The clavipectoral fascia is incised longitudinally. The incision is typically made inferior to the clavicle, along the medial border of the conjoined tendon. This releases the pectoralis major and allows it to be further retracted medially.
  • Caution: Avoid excessive superior dissection under the clavicle, as the thoracoacromial artery and the cords of the brachial plexus are in close proximity.
• Coracoid Process and Conjoined Tendon: Following the fascial incision, the coracoid process becomes clearly visible superiorly in the wound. The conjoined tendon (short head of the biceps brachii and coracobrachialis muscles) is seen originating from the tip of the coracoid.
• Conjoined Tendon Retraction: The conjoined tendon is a critical structure that guides deeper dissection. For most procedures requiring extensive glenohumeral joint access, the conjoined tendon is gently retracted medially.
  • Neurovascular Protection: Extreme or forceful medial retraction poses a significant risk to the musculocutaneous nerve (which enters the coracobrachialis approximately 5-8 cm distal to the coracoid) and, more importantly, the underlying axillary neurovascular bundle (axillary artery, axillary vein, and brachial plexus cords). Use broad, blunt retractors (e.g., a wide Hohmann retractor) to gently support the conjoined tendon and protect these deep structures.

4. Subscapularis and Capsular Management

The management of the subscapularis and anterior capsule is tailored to the specific pathology. This is a crucial step for gaining intra-articular access.

a. Axillary Nerve Identification and Protection

• Critical Step: Before any incision into the subscapularis or capsule, the axillary nerve and anterior humeral circumflex artery must be identified and protected. These structures course approximately 5-7 cm distal to the acromion, inferior to the subscapularis, around the surgical neck of the humerus.
• Technique: Palpate the inferior border of the subscapularis. Carefully place a blunt Hohmann retractor beneath this inferior border, sweeping it gently superiorly and inferiorly along the humeral neck to separate and protect the axillary nerve and its accompanying vessels. This retractor should remain in place throughout the deep dissection.

b. Subscapularis Management Options

• 1. Subscapularis Tenotomy (Most Common for Arthroplasty):
  • Incision: The subscapularis tendon is sharply detached from its insertion on the lesser tuberosity. The cut is typically made 1-1.5 cm medial to its bony insertion, leaving a cuff of tendon on the tuberosity for subsequent repair. The incision can be made from superior to inferior or inferior to superior. For superior-to-inferior, protect the biceps tendon and supraspinatus. For inferior-to-superior, ensure the axillary nerve is protected.
  • Mobilization: Heavy, non-absorbable stay sutures (e.g., #2 Fiberwire) are placed in the free edge of the tendon. The subscapularis muscle belly is then mobilized from the anterior capsule and anterior humeral neck by blunt and sharp dissection, allowing it to be retracted medially. This provides full exposure of the anterior capsule.
• 2. Subscapularis Peel (Capsular-Subscapularis Release – Common for Instability):
  • Elevation: The anterior capsule and subscapularis tendon are elevated as a single layer from the anterior glenoid rim and humeral neck. A scalpel is used to incise the capsule directly on the anterior glenoid rim. Then, a periosteal elevator is used to carefully reflect the labrum, capsule, and subscapularis off the anterior glenoid and medial humeral neck. This preserves the tendon length and often maintains its nerve supply from the superior subscapular nerve (though inferior branches are at risk if dissection is too extensive).
• 3. Lesser Tuberosity Osteotomy (Less Common, for specific situations):
  • Technique: A small osteotomy of the lesser tuberosity, with the subscapularis tendon attached, is performed using an oscillating saw. This provides a robust bone block for reattachment.
  • Indications: May be considered in revision cases, when subscapularis quality is poor, or when maximum exposure and a strong repair are desired.
  • Disadvantage: Carries risks of non-union or avulsion of the osteotomized segment.

c. Capsular Management

• Capsulotomy: Once the subscapularis is retracted, the underlying anterior capsule is exposed. An incision is made in the capsule to gain access to the glenohumeral joint.
  • T-Capsulotomy: A common and versatile approach, involving a vertical incision along the anterior humeral neck (often extended superiorly and inferiorly from the bicipital groove) with horizontal extensions, creating a "T" shape. This allows for excellent exposure and controlled closure.
  • Straight Vertical Capsulotomy: A simple longitudinal incision.
  • Caution: The inferior limb of any capsulotomy must be performed with extreme care to avoid injuring the axillary nerve and anterior humeral circumflex artery, which are directly inferior.
• Capsular Release: Depending on the procedure (e.g., for adhesive capsulitis or to improve mobility in arthroplasty), further capsular releases may be performed, always with vigilance for neurovascular structures, especially posteriorly.

5. Intra-Articular Maneuvers / Reduction / Fixation (Procedure-Dependent)

This stage involves specific interventions tailored to the underlying pathology.

For Proximal Humerus Fracture Fixation (ORIF)

• Fracture Reduction: The fracture hematoma is evacuated. The humeral head and tuberosities are anatomically reduced using direct visualization, specialized fracture reduction clamps, temporary K-wires, or sutures passed through the rotator cuff tendons. The arm is often positioned in slight abduction and external rotation to aid in tuberosity reduction. Fluoroscopy confirms satisfactory reduction.
• Plate Application: A locking plate (e.g., Philos plate) is typically applied to the lateral aspect of the humerus, positioned slightly distal to the greater tuberosity to avoid impingement. The plate must be positioned carefully to ensure adequate screw purchase in the humeral head while avoiding over-penetration or impingement.
• Screw Insertion: Locking screws are inserted into the humeral head, aiming for optimal purchase in the subchondral bone. Lag screws can be used across specific fracture lines. Bi-cortical screws are used distally. Throughout screw insertion, ensure the axillary nerve is protected, especially with distal screws.

For Shoulder Arthroplasty (TSA, Hemiarthroplasty, RTSA)

• Humeral Head Resection: The humeral head is dislocated (if not already luxated). An oscillating saw, guided by specific cutting guides, resects the humeral head at the anatomical neck. The cut is performed to restore appropriate humeral version (typically 20-30 degrees retroversion relative to the epicondylar axis) and height, based on pre-operative templating and intraoperative assessment.
• Humeral Canal Preparation: The humeral canal is prepared using reamers and broaches, gradually increasing in size until appropriate fit is achieved for the chosen prosthetic stem (cemented or uncemented).
• Glenoid Preparation (for TSA and RTSA): The humeral head is completely dislocated or removed. A glenoid retractor (e.g., Fukuda retractor) is carefully placed posteriorly to expose the entire glenoid articular surface.
  • TSA: The glenoid articular cartilage and any osteophytes are débrided. The glenoid is reamed (if required) to create a flat, concentric surface for the glenoid component. The glenoid component (typically cemented polyethylene) is then impacted or screwed into place, ensuring appropriate version and inclination.
  • RTSA: The glenoid is prepared for the baseplate. Reaming is performed to achieve optimal baseplate position, followed by baseplate insertion and fixation with screws. The glenosphere is then attached to the baseplate.
• Component Implantation: The definitive humeral stem and head components (or articular liner for RTSA) are implanted. For TSA, the glenoid component is then inserted. For RTSA, the glenosphere is attached.
• Soft Tissue Balancing and Stability Assessment: After component implantation, the joint is reduced. The surgeon assesses the range of motion, soft tissue tension, and joint stability throughout the physiological range. Adjustments may be made (e.g., soft tissue releases, component changes) to achieve optimal balance.

For Instability Surgery (Bankart, Latarjet)

• Bankart Repair: After subscapularis peel and capsulotomy, the anterior glenoid rim is exposed. Any fibrous tissue or granulation tissue on the glenoid rim is debrided to expose bleeding bone. Suture anchors are placed into the anterior glenoid neck. Strong non-absorbable sutures are passed through the avulsed labrum and capsule and then tied, meticulously reattaching the labrum and capsule to the glenoid, reconstructing the anterior bumper.
• Latarjet Procedure:
  • After exposing the coracoid process, the pectoralis minor tendon is released from its insertion on the coracoid.
  • The coracoacromial ligament is also released.
  • The coracoid is osteotomized (typically 2 cm distal to its tip) using an oscillating saw, preserving the conjoined tendon's insertion.
  • The detached coracoid block, with the conjoined tendon attached, is then transferred through a split in the subscapularis muscle (or inferior to it) and secured to the anterior glenoid neck using two cortical screws, positioned parallel to the glenoid joint surface. This creates a bony buttress and a dynamic sling effect from the conjoined tendon, preventing anterior dislocation.

6. Wound Closure

• Capsule Repair: The anterior capsule is meticulously repaired using strong, absorbable sutures (e.g., #1 or #2 Vicryl). For instability cases, the capsule may be plicated or overlapped to reinforce stability and reduce capsular volume.
• Subscapularis Repair: This is a crucial step for restoring shoulder function and stability, particularly after arthroplasty or tenotomy.
  • The subscapularis tendon, with its previously placed stay sutures, is reattached to its anatomical insertion on the lesser tuberosity. This is typically achieved using strong, non-absorbable sutures (e.g., #2 Fiberwire) in a transosseous, suture anchor, or transosseous-equivalent technique. The repair must be secure, without excessive tension or laxity, to allow for healing and restore internal rotation strength.
  • If a lesser tuberosity osteotomy was performed, the bone block is reattached using screws or strong sutures.
• Deltopectoral Interval Re-approximation: The deltopectoral interval is loosely approximated using a few absorbable sutures. Avoid tight closure that could cause muscle strangulation.
• Subcutaneous Layer: Closed with interrupted absorbable sutures.
• Skin Closure: Closed with staples or subcuticular absorbable sutures.
• Drain Placement: A suction drain (e.g., Hemovac) may be placed deep to the deltoid, particularly after arthroplasty or complex trauma, to prevent hematoma formation. It is typically removed within 24-48 hours when drainage volume decreases.
• Dressing and Immobilization: A sterile dressing is applied, and the arm is placed in an appropriate immobilizer (e.g., sling, abduction brace) according to the specific post-operative protocol for the procedure performed.

Complications & Management

Despite its established safety profile, the deltopectoral approach carries a risk of complications. A comprehensive understanding of these potential issues, their incidence, and effective management strategies is essential for orthopedic surgeons.

| Complication | Incidence (Approx.) | Salvage / Management Strategy DeltoService as the "Official Healthcare Provider of the Philadelphia Union." In a release from the team, the partnership makes Rothman Orthopaedic Institute the "Official Orthopaedic Provider of the Philadelphia Union."

"We are incredibly proud to partner with the Philadelphia Union, an organization that shares our commitment to excellence and community," said Alexander R. Vaccaro, MD, PhD, MBA, President of Rothman Orthopaedic Institute, Richard H. Rothman Professor and Chairman of the Department of Orthopaedic Surgery at Thomas Jefferson University and Hospitals. "Our physicians are leaders in orthopaedics, and we are excited to extend our expertise to support the health and performance of the Union players, while also engaging with their passionate fanbase."

This partnership brings together two prominent Philadelphia-area organizations to promote athletic excellence and community engagement.

"We are excited to partner with Rothman Orthopaedic Institute as the Official Healthcare and Orthopaedic Provider of the Philadelphia Union," said Philadelphia Union President, Tim McDermott. "Their dedication to patient care and their reputation for excellence in orthopaedics make them an ideal partner to support the health and performance of our athletes. We look forward to a successful collaboration that benefits both our team and the community."

Rothman Orthopaedic Institute has a long-standing history of providing top-tier orthopaedic care to professional sports organizations, including the Philadelphia Eagles, Phillies, and 76ers, as well as several collegiate and high school athletic programs. This new partnership with the Philadelphia Union further expands Rothman's commitment to supporting athletic endeavors across all levels of competition.

As part of the partnership, Rothman Orthopaedic Institute will provide comprehensive orthopaedic care to Philadelphia Union players, including injury prevention, diagnosis, treatment, and rehabilitation. Union players will have access to Rothman's team of highly skilled orthopaedic surgeons, sports medicine specialists, and physical therapists, ensuring they receive the highest level of care.

In addition to player care, Rothman Orthopaedic Institute and the Philadelphia Union will collaborate on various community initiatives aimed at promoting health, wellness, and youth sports. These initiatives will include educational programs, community outreach events, and youth soccer clinics, providing opportunities for fans and aspiring athletes to engage with both organizations.

The partnership underscores Rothman Orthopaedic Institute's dedication to supporting athletes and promoting healthy lifestyles within the communities it serves. By aligning with the Philadelphia Union, Rothman aims to inspire individuals of all ages to pursue their athletic passions and prioritize their musculoskeletal health.

The Philadelphia Union, a Major League Soccer (MLS) team, has established itself as a beloved sports franchise in the Philadelphia region. Known for its passionate fanbase and commitment to developing local talent, the Union has achieved significant success on the field, including winning the Supporters' Shield in 2020. This partnership with Rothman Orthopaedic Institute reinforces the Union's commitment to providing its players with the best possible care and enhancing its community engagement efforts.

This partnership is effective immediately, with Rothman Orthopaedic Institute's medical team seamlessly integrating into the Philadelphia Union's player care program. Both organizations look forward to a long and successful collaboration, dedicated to excellence on and off the field.

About Rothman Orthopaedic Institute:

Rothman Orthopaedic Institute is a world-renowned orthopaedic practice dedicated to providing the highest quality of patient care, education, and research. With a team of highly skilled physicians, surgeons, and specialists, Rothman offers comprehensive orthopaedic services across various subspecialties, including spine, sports medicine, joint replacement, hand & wrist, foot & ankle, trauma, and physical medicine & rehabilitation. Rothman is recognized for its commitment to clinical excellence, innovative research, and leadership in orthopaedic education.

About Philadelphia Union:

The Philadelphia Union is an American professional soccer club based in Chester, Pennsylvania, that competes in Major League Soccer (MLS). Founded in 2008, the club began play in 2010 as an expansion team. The Union plays its home games at Subaru Park, an 18,500-seat stadium located along the Delaware River. The club's colors are navy blue and gold. The Union has a passionate fanbase and is committed to developing local talent through its acclaimed academy system. The club won the Supporters' Shield in 2020.