Surgical Approaches to Humeral Fractures: A Comprehensive Anatomical & Biomechanical Guide

Introduction & Epidemiology

Fractures of the humerus represent a significant portion of upper extremity trauma, ranging from high-energy injuries in young, active individuals to fragility fractures in the elderly. The humerus, connecting the shoulder girdle to the forearm, is anatomically divided into the proximal humerus, humeral shaft (diaphysis), and distal humerus (condyle). Each segment presents unique anatomical challenges and demands specific surgical considerations for optimal outcomes. Proximal humeral fractures account for approximately 5% of all fractures and 45% of all humeral fractures, with a bimodal distribution peaking in young males and elderly females. Humeral shaft fractures constitute 3-5% of all fractures, often associated with direct trauma or torsional forces. Distal humeral fractures, while less common, are particularly challenging due to complex articular anatomy and proximity to vital neurovascular structures, comprising about 2-4% of all adult fractures. Mastery of diverse surgical approaches is paramount for orthopedic surgeons to effectively address the broad spectrum of humeral pathologies, ensuring appropriate exposure for reduction, rigid fixation, and preservation of neurovascular integrity. This guide aims to provide a comprehensive, high-yield overview of the critical aspects involved in managing humeral fractures surgically, from anatomical foundations to post-operative rehabilitation.

Surgical Anatomy & Biomechanics

A profound understanding of the surgical anatomy of the humerus, including bony landmarks, muscle attachments, and neurovascular pathways, is fundamental to minimizing iatrogenic injury and achieving successful outcomes.

Proximal Humerus

The proximal humerus includes the humeral head, anatomical neck, surgical neck, greater tuberosity, and lesser tuberosity.
* Musculature: The rotator cuff muscles (supraspinatus, infraspinatus, teres minor, subscapularis) insert onto the tuberosities, providing both motion and stability. The deltoid muscle covers the tuberosities and surgical neck, originating from the clavicle, acromion, and scapular spine, inserting onto the deltoid tuberosity on the mid-lateral humerus. The pectoralis major inserts onto the lateral lip of the bicipital groove.
* Neurovascular Structures:
* Axillary Nerve: Arises from the posterior cord of the brachial plexus (C5-C6), courses inferior to the glenohumeral joint capsule, then posteriorly around the surgical neck of the humerus (approximately 5-7 cm distal to the acromial edge) in close proximity to the posterior circumflex humeral artery, entering the quadrangular space to supply the deltoid and teres minor. It is highly vulnerable during surgical approaches to the proximal humerus and shaft.
* Musculocutaneous Nerve: Arises from the lateral cord (C5-C7), pierces the coracobrachialis, and supplies the biceps brachii and brachialis.
* Cephalic Vein: Located in the deltopectoral groove, serving as a key landmark.
* Anterior and Posterior Circumflex Humeral Arteries: Branches of the axillary artery, supplying the humeral head, particularly the arcuate artery, a branch of the anterior circumflex, which ascends the bicipital groove. Disruption can lead to avascular necrosis.
* Biomechanics: The complex anatomy allows for a wide range of motion. Fractures often disrupt the intricate balance of forces from the rotator cuff and deltoid, leading to displacement. Stability is crucial for early mobilization.

Humeral Shaft

The humeral shaft extends from the surgical neck to the supracondylar ridges.
* Musculature:
* Anterior Compartment: Biceps brachii, coracobrachialis, brachialis.
* Posterior Compartment: Triceps brachii (long, lateral, and medial heads).
* Lateral: Deltoid insertion, brachioradialis origin (distally).
* Neurovascular Structures:
* Radial Nerve: The most critical structure. Originating from the posterior cord (C5-T1), it courses posteriorly, lying directly on the periosteum of the humerus in the spiral groove (radial groove) between the lateral and medial heads of the triceps. It then pierces the lateral intermuscular septum approximately 10-14 cm proximal to the lateral epicondyle, continuing anteriorly into the forearm. Its vulnerability in this groove makes humeral shaft fractures particularly prone to radial nerve palsy (incidence up to 18%).
* Brachial Artery and Median Nerve: Course in the medial neurovascular bundle, anterior to the medial intermuscular septum. The median nerve lies lateral to the brachial artery proximally, crossing anteriorly to become medial distally.
* Ulnar Nerve: Courses along the medial aspect of the arm, posterior to the medial intermuscular septum, then passes through the cubital tunnel posterior to the medial epicondyle.
* Biomechanics: The shaft acts as a lever for powerful arm movements. Forces from the surrounding musculature can cause significant displacement, angulation, and rotation in fractures. Torsional forces are common mechanisms for spiral fractures.

Distal Humerus

The distal humerus includes the capitellum, trochlea, medial and lateral epicondyles, and the olecranon and coronoid fossae.
* Musculature: Origins for forearm flexors (medial epicondyle) and extensors (lateral epicondyle). The brachialis inserts onto the coronoid process and ulnar tuberosity. The triceps inserts onto the olecranon.
* Neurovascular Structures:
* Ulnar Nerve: Most vulnerable, passes through the cubital tunnel posterior to the medial epicondyle.
* Radial Nerve: Divides into superficial and deep (posterior interosseous) branches anterior to the lateral epicondyle.
* Median Nerve and Brachial Artery: Pass anterior to the elbow joint.
* Biomechanics: Articular fractures demand precise anatomical reduction and stable fixation to restore joint congruity and allow early motion, crucial for preventing stiffness.

Indications & Contraindications

The decision to treat a humeral fracture operatively or non-operatively is multifactorial, considering fracture morphology, patient factors, and surgeon expertise.

Operative vs. Non-Operative Indications

General Contraindications

• Absolute: Severe active infection at the surgical site, patient medically unstable for anesthesia.
• Relative: Severe soft tissue compromise (e.g., extensive blistering, crush injury), extreme osteoporosis precluding stable fixation, severe pre-existing neurological deficits where surgical intervention offers no functional benefit, patients with limited life expectancy or severe comorbidities where risks outweigh benefits.

Pre-Operative Planning & Patient Positioning

Meticulous pre-operative planning is the cornerstone of successful humeral fracture surgery.

Pre-Operative Assessment

1. Clinical Evaluation: Thorough history and physical examination, including neurovascular status (radial, median, ulnar, axillary nerves; brachial, radial, ulnar pulses). Document any pre-existing deficits.
2. Imaging:
   • Radiographs: Anteroposterior (AP) and true lateral views of the shoulder, humerus, and elbow as appropriate. True scapular Y and axillary views are essential for proximal humerus. Full-length humerus radiographs are vital for shaft fractures.
   • Computed Tomography (CT): Indispensable for complex articular fractures (proximal and distal humerus), providing detailed information on fracture morphology, fragment displacement, articular involvement, and bone loss. 3D reconstructions are particularly useful.
   • Magnetic Resonance Imaging (MRI): Less commonly used acutely but can be valuable for assessing rotator cuff tears in proximal humerus fractures, soft tissue interposition, or suspected pathological fractures.
3. Medical Optimization: Coordinate with internal medicine or anesthesia to optimize patient comorbidities.
4. Implant Selection: Based on fracture pattern, bone quality, and surgical approach. Options include locking plates (LCP), non-locking plates, intramedullary nails (IMN), external fixators, or prostheses (hemiarthroplasty/reverse total shoulder arthroplasty for complex proximal humerus fractures in specific populations).
5. Contingency Planning: Always have backup implants and tools available (e.g., small fragment set for fibular graft, different plate sizes/lengths, IMN options). Plan for potential bone grafting.

Patient Positioning

Proper positioning ensures optimal surgical exposure, minimizes neurovascular tension, and facilitates fluoroscopy.

• Proximal Humerus:
  • Beach Chair (Semi-Fowler) Position: Most common. Allows for good access to the shoulder, facilitates fluoroscopy, and permits easy draping for potential fibular graft harvest. The head is supported, the torso elevated, and the arm free-draped. Ensure adequate padding of pressure points.
  • Supine Position: Less common for complex proximal fractures, but can be used for simpler cases or when a deltopectoral approach is used. Requires a shoulder bump to protract the scapula.
• Humeral Shaft:
  • Supine Position: Ideal for anterior and anterolateral approaches. The arm is draped free on a hand table, allowing full manipulation and fluoroscopy. A bump under the ipsilateral shoulder may assist.
  • Lateral Decubitus Position: Used for posterior approaches to the mid-distal shaft. The patient lies on the unaffected side, the affected arm suspended in traction or supported on a chest roll, allowing access to the posterior aspect.
  • Prone Position: Can be used for posterior approaches, especially for the distal shaft, but may complicate airway management.
• Distal Humerus:
  • Lateral Decubitus Position: Most common, especially with a positioner like a "beanbag" and a padded arm board or commercially available elbow traction tower for distraction. Allows for a posterior approach with excellent access to the posterior aspect of the elbow.
  • Prone Position: An alternative for posterior approaches, but airway management is critical.
  • Supine Position: Less common for complex distal humerus fractures, generally reserved for specific anterior or anterolateral approaches.

Tourniquet Use: Highly debated for humeral surgery. While it provides a bloodless field, it precludes intra-operative assessment of neurovascular status and can potentially contribute to nerve injury or post-operative swelling. Many surgeons prefer not to use a tourniquet for humeral shaft fractures, relying on careful dissection and electrocautery for hemostasis. For distal humerus surgery, especially complex intra-articular fractures, a tourniquet is often used to ensure optimal visualization of articular fragments.

Detailed Surgical Approach / Technique

This section will delineate common surgical approaches, highlighting internervous planes, critical anatomical landmarks, and general principles of reduction and fixation.

I. Proximal Humerus Approaches

A. Deltopectoral Approach (Anterior Approach to Proximal Humerus)

• Indications: Most common approach for open reduction and internal fixation (ORIF) of proximal humeral fractures (2-, 3-, and 4-part), humeral head replacement, shoulder arthroplasty, and certain tumor resections.
• Internervous Plane: Between the deltoid (axillary nerve) and pectoralis major (medial and lateral pectoral nerves).
• Technique:
  1. Incision: A longitudinal incision, typically 10-15 cm, centered over the deltopectoral groove, starting from the clavicle and extending distally towards the deltoid tuberosity.
  2. Superficial Dissection: Identify the deltopectoral groove. The cephalic vein, a key landmark, resides within this groove. It is usually retracted laterally with the deltoid, or ligated if necessary for improved exposure.
  3. Deep Dissection: Retract the pectoralis major medially and the deltoid laterally. This exposes the clavipectoral fascia, which is incised longitudinally.
  4. Coracoid Process and Muscles: Identify the coracoid process and its attached muscles (pectoralis minor, coracobrachialis, short head of biceps). These are typically retracted medially.
  5. Subscapularis Tendon: The anterior shoulder capsule and subscapularis muscle are exposed. The subscapularis may need to be released from its insertion on the lesser tuberosity (often with a cuff-sparing tenotomy or subscapularis peel) to gain access to the humeral head and glenoid.
  6. Axillary Nerve Protection: The axillary nerve enters the deltoid posteriorly and is typically safe with careful anterior dissection. However, avoid excessive lateral retraction of the deltoid, especially distally. Its distance from the acromion is typically 5-7 cm.
  7. Reduction and Fixation: Once exposed, the fracture fragments are reduced under direct visualization and fluoroscopic guidance. Temporary fixation with K-wires or reduction clamps is used. Plate osteosynthesis (e.g., locking plate, anatomical specific plates for proximal humerus) is then applied, securing the construct. Care must be taken to avoid plate placement too superiorly to prevent impingement. Suture anchors may be used for tuberosity reattachment.

B. Anterolateral Approach (Delta-split) for Proximal Humerus / IMN Insertion

• Indications: Primarily for insertion of antegrade intramedullary nails (IMN) for proximal or diaphyseal fractures, or for percutaneous plating.
• Internervous Plane: Intramuscular split within the deltoid.
• Technique:
  1. Incision: A short (3-5 cm) longitudinal incision over the superior aspect of the shoulder, just anterior to the lateral acromion.
  2. Deltoid Split: The deltoid fibers are split bluntly in line with their fibers. Crucially, the split should not extend more than 5 cm distal to the acromion to avoid injury to the axillary nerve.
  3. Rotator Cuff/Greater Tuberosity: The underlying rotator cuff (supraspinatus and infraspinatus) and greater tuberosity are exposed.
  4. Entry Point: The entry point for IMN is typically through the greater tuberosity, medial to the supraspinatus insertion, or through the head if a more lateral entry is needed, aiming for the apex of the humeral head.
  5. Reduction and Nailing: The fracture is reduced, and the IMN is inserted and locked proximally and distally.
• Risks: Axillary nerve injury if the deltoid split is too extensive; rotator cuff damage; impingement from prominent nail or locking screws.

II. Humeral Shaft Approaches

A. Anterolateral Approach to Humeral Shaft (Modified Henry's Approach)

• Indications: Fractures of the proximal and middle third of the humeral shaft, especially those amenable to plating. Good for fractures extending into the proximal or distal metaphysis.
• Internervous Plane: Between the deltoid (axillary nerve) proximally and between the brachialis (musculocutaneous nerve) and triceps (radial nerve) or between the brachialis and brachioradialis (radial nerve) distally.
• Technique:
  1. Incision: Longitudinal incision on the anterolateral aspect of the arm, extending from the deltoid insertion distally.
  2. Superficial Dissection: Incise deep fascia.
  3. Proximally: Retract the deltoid anteriorly, or split its anterior fibers. The biceps is retracted medially.
  4. Midshaft: The internervous plane is typically found between the brachialis (supplied by musculocutaneous nerve) and the triceps (supplied by radial nerve) or between the brachialis and brachioradialis. The brachialis muscle is typically split longitudinally or elevated.
  5. Radial Nerve: Crucial step. The radial nerve typically pierces the lateral intermuscular septum distally and then runs anteriorly. It is vital to identify and protect the radial nerve. It lies in the spiral groove posteriorly, but as it comes anteriorly, it is vulnerable as it crosses the humerus. If dissection extends posterior to the lateral intermuscular septum, the radial nerve must be actively sought and protected.
  6. Reduction and Fixation: Reduce the fracture using direct visualization and clamps. Apply a plate (e.g., locking compression plate) to the anterolateral surface of the humerus.

B. Minimally Invasive Anterior Approach to the Humeral Shaft (MIPO - Minimally Invasive Plate Osteosynthesis)

• Indications: Diaphyseal humeral fractures, often for bridging comminuted segments, especially in osteoporotic bone or when extensive soft tissue stripping is undesirable.
• Internervous Plane: Utilizes small windows through various planes to slide the plate submuscularly or subcutaneously.
• Technique:
  1. Incision: Two small incisions: one proximal and one distal, often on the anterolateral aspect of the arm.
  2. Submuscular Tunneling: A plate is guided through a submuscular tunnel created between the two incisions, typically beneath the deltoid and brachialis, but superficial to the periosteum.
  3. Radial Nerve Protection: This technique aims to avoid direct exposure of the radial nerve. However, careful technique is required, especially during distal plate insertion and screw placement, where the radial nerve is vulnerable as it crosses anteriorly. Use blunt dissection and palpation to identify the nerve.
  4. Fixation: Screws are inserted percutaneously or through small windows, guided by fluoroscopy.
• Advantages: Less soft tissue dissection, potentially faster healing, lower infection rate.
• Disadvantages: Requires precise fluoroscopic control, potential for iatrogenic radial nerve injury with blind screw placement.

C. Posterior Approach to the Humeral Shaft (Triceps-Splitting or Paratricipital)

• Indications: Proximal one-third and distal one-third humeral shaft fractures, especially those with posterior displacement or comminution. Excellent for fractures extending into the olecranon fossa.
• Internervous Plane:
  • Triceps-Splitting: Intramuscular split within the triceps (all heads supplied by radial nerve).
  • Paratricipital: Between the lateral head of the triceps (radial nerve) and the brachialis (musculocutaneous nerve). This is less common for shaft.
• Technique:
  1. Incision: A longitudinal incision along the posterior aspect of the arm, centered over the fracture site.
  2. Superficial Dissection: Incise deep fascia.
  3. Radial Nerve Identification: This is the most critical step.
     • Proximal Shaft: The radial nerve lies deep to the long and medial heads of the triceps.
     • Midshaft: The radial nerve runs in the spiral groove between the lateral and medial heads of the triceps. It is often covered by a fascial layer. Careful blunt dissection is required to identify and mobilize it.
     • Distal Shaft: The radial nerve pierces the lateral intermuscular septum to move anteriorly.
  4. Triceps Split: Once the radial nerve is identified and protected, the triceps muscle is split longitudinally, or one can create a paratricipital approach by retracting the triceps laterally and brachialis medially, or medially and laterally respectively. The triceps splitting approach provides direct access to the posterior surface.
  5. Reduction and Fixation: Reduce the fracture. A plate is typically applied to the posterior or posterolateral aspect of the humerus. Ensure screws are bicortical where possible and do not compromise the radial nerve.

III. Distal Humerus Approaches

A. Posterior Approach to Distal Humerus (Triceps-Sparing, Triceps-Splitting, or Olecranon Osteotomy)

• Indications: The gold standard for most complex intra-articular and supracondylar distal humeral fractures, offering excellent visualization of the articular surface.
• Internervous Plane: No true internervous plane if splitting the triceps or performing an osteotomy.
• Technique (Olecranon Osteotomy - most common and versatile):
  1. Incision: A posterior longitudinal incision centered over the olecranon, extending proximally along the triceps and distally along the ulna.
  2. Ulnar Nerve Identification: Crucial first step. Identify the ulnar nerve in the cubital tunnel posterior to the medial epicondyle. It must be carefully mobilized (ulnar nerve transposition) from the cubital tunnel and retracted anteriorly or medially, protecting it throughout the procedure.
  3. Olecranon Osteotomy:
     • Chevron Osteotomy: Preferred for stability. An inverted V-shaped cut is made in the olecranon, preserving the articular cartilage.
     • Transverse Osteotomy: Easier but potentially less stable.
     • The osteotomy is typically performed proximal to the olecranon fossa to avoid damaging the articular surface.
  4. Triceps Reflection: The triceps muscle, along with the olecranon fragment, is reflected proximally, exposing the entire distal humeral articular surface and both columns.
  5. Fracture Reduction and Fixation:
     • Articular Reconstruction: Meticulously reduce the articular fragments and secure them with small K-wires or headless compression screws. Restore the trochlear groove.
     • Columnar Fixation: The medial and lateral columns are then reduced to the reconstructed articular segment and fixed with plates (e.g., parallel plating or orthogonal plating constructs). Typically, two plates are used: one posterolateral and one medial column plate, ensuring stable fixation and proper epicondylar alignment.
     • Olecranon Refixation: Once the humeral fracture is fixed, the olecranon osteotomy is repaired, typically with a tension band wiring technique or an intramedullary screw/plate, ensuring stable fixation to allow early elbow motion.
• Technique (Triceps-Sparing, Paratricipital):
  1. Incision & Ulnar Nerve: Similar posterior incision and ulnar nerve identification.
  2. Triceps Mobilization: The triceps muscle is carefully elevated subperiosteally off the posterior humerus or split longitudinally in the midline. The posterior capsule is incised. This provides less exposure than an olecranon osteotomy but avoids an additional fracture.
  3. Reduction and Fixation: Similar principles, but exposure is limited, making complex articular reduction challenging.

B. Anterolateral Approach to the Distal Humerus

• Indications: Specific fractures of the capitellum, lateral column, or some supracondylar fractures where anterior plating is desired, especially for unicondylar fractures. Less common for complex bicondylar fractures.
• Internervous Plane: Between the brachialis (musculocutaneous nerve) and the brachioradialis (radial nerve).
• Technique:
  1. Incision: Longitudinal incision on the anterolateral aspect of the distal arm, centered over the distal humerus.
  2. Deep Dissection: Identify the interval between the brachialis (medially) and the brachioradialis (laterally).
  3. Radial Nerve Protection: The radial nerve is found in this interval, typically anterior to the lateral epicondyle, dividing into its superficial and deep branches. It must be identified and protected, usually by retracting it laterally with the brachioradialis.
  4. Exposure: Retract the brachialis medially. This exposes the anterior surface of the distal humerus and the capitellum.
  5. Reduction and Fixation: Reduce the fracture fragments. Plating is typically applied to the anterior or anterolateral surface.

C. Lateral Approach to the Distal Humerus (Kocher Approach)

• Indications: Primarily for fractures of the capitellum and lateral condyle, and for epicondylar fractures, offering direct visualization of the lateral articular surface.
• Internervous Plane: Between the anconeus (radial nerve) and extensor carpi ulnaris (radial nerve, deep branch). Often considered a safe interval in the elbow.
• Technique:
  1. Incision: A curvilinear incision centered over the lateral epicondyle, extending proximally along the lateral supracondylar ridge and distally along the forearm extensors.
  2. Superficial Dissection: Incise the deep fascia.
  3. Interval: Identify the interval between the anconeus and extensor carpi ulnaris. Dissect through this interval.
  4. Radial Nerve Protection: The radial nerve (and its posterior interosseous branch) must be protected as it lies anterior to the lateral epicondyle, deep to the brachioradialis and extensor carpi radialis longus. Avoid aggressive anterior retraction.
  5. Exposure: Retract the anconeus posteriorly and the forearm extensors anteriorly to expose the lateral epicondyle, lateral column, and capitellum.
  6. Reduction and Fixation: Reduce the fragments. Fixation with headless screws or small plates is common for capitellar fractures.

Complications & Management

Despite meticulous surgical technique, complications can occur. Early recognition and appropriate management are crucial.

Post-Operative Rehabilitation Protocols

Post-operative rehabilitation is as critical as the surgery itself. Protocols vary based on fracture location, stability of fixation, patient comorbidities, and surgeon preference. The overarching goal is to restore strength and range of motion while protecting the healing fracture.

General Principles

• Pain Management: Adequate pain control is essential for patient compliance with therapy.
• Edema Control: Elevation, cryotherapy, and gentle compression.
• Early Motion: Generally encouraged, especially for the shoulder and elbow, to prevent stiffness, if fixation is deemed stable enough.
• Progressive Loading: Gradual increase in resistance and weight-bearing activities.
• Patient Education: Crucial for adherence to restrictions and exercises.

Proximal Humerus Fractures

• Phase I (0-6 weeks): Protection and Gentle Motion
  • Immobilization: Sling for comfort and protection (e.g., universal sling with or without an abduction pillow) for 4-6 weeks, with periods of active wrist and hand range of motion (ROM).
  • Passive ROM: Pendulum exercises (Codman's exercises) initiated early. Gentle passive external rotation and forward elevation (to 90 degrees) may be started around 2-3 weeks post-op, as tolerated and dictated by fracture stability.
  • Goals: Minimize pain, prevent stiffness, protect fracture healing.
• Phase II (6-12 weeks): Active-Assisted and Active ROM
  • Radiographic Assessment: Confirm signs of healing before advancing.
  • Discontinue Sling: As pain allows.
  • Active-Assisted ROM: Use of pulleys, cane exercises, therapist-assisted movements.
  • Active ROM: Gradual progression to active shoulder ROM in all planes.
  • Light Strengthening: Isometric exercises for rotator cuff and deltoid, light resistance band exercises.
  • Goals: Restore full non-painful active ROM, begin to regain strength.
• Phase III (12+ weeks): Strengthening and Return to Activity
  • Progressive Strengthening: Increase resistance with weights, resistance bands. Focus on rotator cuff, deltoid, and scapular stabilizers.
  • Functional Training: Sport-specific or work-specific activities.
  • Goals: Maximize strength and endurance, return to pre-injury activities.
  • Note: Full recovery can take 6-12 months or longer, especially for complex fractures.

Humeral Shaft Fractures

• Phase I (0-6 weeks): Protection and Early ROM
  • Immobilization: Sling for comfort. Arm is often allowed to hang freely for gravity-assisted alignment, especially if not rigidly fixed.
  • Early ROM: Active elbow, wrist, and hand ROM should be initiated immediately to prevent stiffness. Gentle passive shoulder ROM (pendulum, external rotation to 30 degrees) may be allowed.
  • Weight Bearing: Non-weight-bearing of the affected arm.
  • Goals: Maintain joint mobility above and below the fracture, promote early healing.
• Phase II (6-12 weeks): Progressive Motion and Light Strengthening
  • Radiographic Assessment: Evaluate healing.
  • Active ROM: Gradual progression of active shoulder and elbow ROM as tolerated.
  • Light Strengthening: Isometric exercises for shoulder, elbow.
  • Goals: Achieve full functional ROM, begin to rebuild muscle strength.
• Phase III (12+ weeks): Advanced Strengthening and Return to Activity
  • Progressive Strengthening: As healing progresses, increase resistance.
  • Functional Training: Gradual return to activities.
  • Note: Return to full strenuous activities is often not permitted until 4-6 months, depending on radiographic union.

Distal Humerus Fractures

• Phase I (0-3 weeks): Protection and Gentle Motion
  • Immobilization: Splint or brace for a short period (1-2 weeks) primarily for comfort and soft tissue healing. Early motion is critical.
  • Early ROM: Immediate initiation of gentle, controlled, active-assisted and passive elbow flexion/extension, pronation/supination (often within protected arcs), provided fixation is stable. Continuous Passive Motion (CPM) may be used.
  • Goals: Prevent stiffness, promote articular cartilage health.
• Phase II (3-6 weeks): Active ROM and Light Strengthening
  • Radiographic Assessment: Evaluate healing.
  • Active ROM: Gradually increase the active ROM of the elbow.
  • Light Strengthening: Isometric exercises for elbow flexors/extensors.
  • Goals: Achieve functional elbow ROM (30-130 degrees), begin to regain strength.
• Phase III (6-12+ weeks): Progressive Strengthening and Return to Activity
  • Progressive Strengthening: Increase resistance to elbow and forearm musculature.
  • Functional Training: Sport-specific or work-related activities.
  • Note: Full elbow ROM may take many months to achieve, and some degree of residual stiffness is common. Heterotopic ossification prophylaxis (NSAIDs/radiation) is often used for high-risk patients.

Summary of Key Literature / Guidelines

The management of humeral fractures is guided by a robust body of literature and established surgical principles.

• AO Principles: The Arbeitsgemeinschaft für Osteosynthesefragen (AO Foundation) principles of fracture management form the bedrock of orthopedic trauma care: anatomical reduction, stable internal fixation, preservation of blood supply, and early, safe mobilization. These principles are consistently applied across all humeral segments.
• Proximal Humerus Fractures:
  • Non-operative vs. Operative: For minimally displaced (Neer 1-part) fractures, non-operative management with early rehabilitation yields good results. For displaced (2-, 3-, 4-part) fractures, operative intervention is often favored in active patients.
  • Plate Osteosynthesis (LCP): Locking compression plates are widely used, demonstrating improved stability in osteoporotic bone. Studies by publications like Journal of Bone and Joint Surgery (JBJS) and Journal of Orthopaedic Trauma (JOT) frequently evaluate outcomes, showing good union rates but variable functional outcomes, particularly with avascular necrosis in complex patterns.
  • Arthroplasty: Reverse total shoulder arthroplasty (rTSA) has gained favor for complex 3- and 4-part fractures in elderly, low-demand patients, especially those with pre-existing rotator cuff dysfunction, offering more predictable pain relief and functional motion than hemiarthroplasty in this cohort (e.g., recent systematic reviews in Journal of Shoulder and Elbow Surgery ).
• Humeral Shaft Fractures:
  • Non-operative Management: Functional bracing has a high union rate (80-90%) for closed, stable diaphyseal fractures, especially for transverse and short oblique patterns. Sarmiento's work is foundational in this area.
  • Intramedullary Nailing (IMN): Antegrade or retrograde nailing is a common surgical option, particularly for segmental, comminuted, or pathological fractures, and for polytrauma patients. While offering less soft tissue disruption, concerns include shoulder pain (with antegrade) and elbow pain (with retrograde) due to implant prominence or disruption of rotator cuff/tendon. Comparative studies in JBJS and JOT show comparable union rates between plating and nailing, with specific advantages and disadvantages depending on fracture location and patient characteristics.
  • Plate Osteosynthesis: Open reduction and plating remains a reliable method, especially for fractures amenable to direct reduction and when precise control of length, alignment, and rotation is required. The anterolateral approach is often preferred for middle and distal third fractures, while the posterior approach is useful for proximal third and distal shaft.
  • Radial Nerve Palsy: The incidence of radial nerve palsy associated with humeral shaft fractures is around 10-18%. Most are neurapraxias and resolve spontaneously (80-90% within 3-6 months). Surgical exploration is typically indicated for open fractures, nerve injury after closed reduction, iatrogenic nerve injury during surgery, or lack of recovery after 3-6 months.
• Distal Humerus Fractures:
  • ORIF with Dual Plating: Anatomical reduction and stable fixation using two plates (e.g., parallel or orthogonal constructs) is the standard of care for displaced intra-articular distal humeral fractures. This allows for early motion. Literature from the AO Trauma group and prominent elbow surgeons emphasizes meticulous articular reduction and robust fixation.
  • Total Elbow Arthroplasty (TEA): Considered for severely comminuted intra-articular fractures in elderly, low-demand patients, especially when bone quality is poor or when stable ORIF is not achievable. Outcomes data from large registries support its use in carefully selected cases.
  • Approaches: The posterior approach with olecranon osteotomy is favored for optimal visualization and reduction of articular fragments, as described in numerous surgical atlases and trauma texts.
  • Complications: High rates of elbow stiffness and heterotopic ossification are reported, necessitating aggressive post-operative rehabilitation and, in some cases, prophylactic measures.

Ongoing research continues to refine surgical techniques, implant designs, and rehabilitation protocols, striving for improved patient outcomes in this complex anatomical region. A commitment to evidence-based practice and continuous learning is paramount for the academic orthopedic surgeon.