Operative Management of Shoulder Girdle Fractures: Clavicle, Scapula, and Proximal Humerus

Comprehensive Introduction and Patho-Epidemiology

The shoulder girdle represents a highly sophisticated biomechanical linkage, structurally defined as the Superior Suspensory Shoulder Complex (SSSC). This complex is a continuous osteoligamentous ring comprising the glenoid process, the coracoid process, the coracoclavicular ligaments, the distal clavicle, the acromioclavicular joint, and the acromial process. The structural integrity of the SSSC is paramount for maintaining the functional relationship between the axial skeleton and the upper extremity. Disruptions to this ring—whether through isolated high-energy fractures, osteoporotic fragility fractures, or combined polytrauma—demand meticulous evaluation. When double disruptions of the SSSC occur, such as the classic "floating shoulder" (ipsilateral clavicle and scapular neck fractures), the intrinsic stability of the shoulder girdle is profoundly compromised, frequently mandating operative intervention to restore the functional anatomy and prevent debilitating long-term morbidity.

Epidemiologically, trauma to the shoulder girdle exhibits a distinct bimodal distribution, reflecting two divergent patient populations and injury mechanisms. Clavicle fractures are remarkably common, accounting for approximately 5% to 10% of all adult fractures. They predominantly affect young, active males sustaining high-energy direct trauma (e.g., motor vehicle collisions, contact sports) and elderly individuals sustaining low-energy falls. Scapula fractures, conversely, are exceedingly rare, representing merely 0.4% to 1% of all fractures. They are almost exclusively the result of massive blunt force trauma, carrying a high association with life-threatening concomitant injuries, including pneumothorax, pulmonary contusion, rib fractures, and brachial plexus avulsions. Proximal humerus fractures account for nearly 6% of all fractures and rank as the third most common fracture pattern in patients over the age of 65. The incidence of proximal humerus fractures is rising exponentially in tandem with the aging demographic, largely driven by osteoporotic bone fragility.

Historically, the prevailing orthopedic dogma dictated that the vast majority of shoulder girdle fractures could be managed nonoperatively with acceptable functional outcomes. The innate mobility of the shoulder joint was thought to compensate for significant osseous malalignment. However, contemporary, rigorously conducted prospective randomized controlled trials have fundamentally challenged this paradigm. We now recognize that specific fracture patterns—such as displaced midshaft clavicle fractures, severely comminuted or head-splitting proximal humerus fractures, and highly displaced intra-articular glenoid fractures—suffer from unacceptably high rates of nonunion, symptomatic malunion, altered scapulothoracic kinematics, and post-traumatic arthropathy when treated with benign neglect. This masterclass delineates the modern, evidence-based indications, precise surgical approaches, and advanced osteosynthesis and arthroplasty techniques required to manage these complex injuries effectively.

Detailed Surgical Anatomy and Biomechanics

A profound mastery of the surgical anatomy and regional biomechanics is the cornerstone of successful operative intervention in the shoulder girdle. The clavicle functions as an S-shaped strut that suspends the scapula and upper extremity away from the thoracic cage, maximizing the functional range of motion. Biomechanically, it is subjected to massive compressive, torsional, and cantilever forces. The medial two-thirds are convex anteriorly and tubular, housing the origins of the pectoralis major and sternocleidomastoid muscles. The distal third is concave anteriorly, flattened, and serves as the attachment site for the deltoid, trapezius, and the critical coracoclavicular (CC) ligaments (conoid and trapezoid). When a midshaft clavicle fracture occurs, predictable deforming forces ensue: the sternocleidomastoid pulls the medial fragment superiorly and posteriorly, while the weight of the arm and the pull of the pectoralis major displace the lateral fragment inferiorly and medially, resulting in the classic foreshortened and depressed clinical posture.

The scapula is a complex, multi-planar flat bone that serves as the foundation for the rotator cuff and periscapular musculature. Its surgical anatomy is defined by thick bone pillars (the lateral border, the scapular spine, and the coracoid base) surrounding incredibly thin, almost translucent bone plates (the supraspinous and infraspinous fossae). The vascular supply is robust, derived primarily from the suprascapular artery and the circumflex scapular branch of the subscapular artery, which anastomose extensively to form the scapular collateral network. Neurologically, the suprascapular nerve is at extreme risk during posterior approaches; it traverses the suprascapular notch (under the superior transverse scapular ligament) to innervate the supraspinatus, then winds around the spinoglenoid notch to innervate the infraspinatus. Scapular neck fractures that medialise the glenoid alter the resting length and tension of the rotator cuff, leading to profound weakness and secondary subacromial impingement.

The proximal humerus is structurally divided into four distinct anatomic segments as conceptualized by Codman and later popularized by Neer: the articular segment (humeral head), the greater tuberosity, the lesser tuberosity, and the humeral diaphysis. The vascularity of the humeral head is a critical determinant of operative decision-making. The primary blood supply arises from the ascending branch of the anterior circumflex humeral artery (the arcuate artery of Laing), which enters the bicipital groove, and the posterior circumflex humeral artery, which provides robust intraosseous perfusion to the posteromedial head. Fracture patterns that disrupt the medial hinge (calcar) or separate the articular segment from the tuberosities severely compromise this delicate blood supply, precipitating avascular necrosis (AVN). The biomechanical deforming forces on the proximal humerus are equally predictable: the supraspinatus and infraspinatus retract the greater tuberosity superiorly and posteriorly, the subscapularis pulls the lesser tuberosity medially, and the pectoralis major draws the humeral shaft medially and anteriorly.

Exhaustive Indications and Contraindications

The decision to proceed with operative intervention must be meticulously tailored to the patient's physiologic age, functional demands, bone quality, and specific fracture morphology. The following table summarizes the absolute and relative indications and contraindications for surgical management of shoulder girdle trauma.

When evaluating a displaced lateral-third clavicle fracture, the surgeon must carefully assess the integrity of the coracoclavicular ligaments. Fractures with detachment of the CC ligaments from the medial fragment (Neer Type II) are highly unstable and carry a nonunion rate exceeding 30% to 40% if managed nonoperatively. Similarly, in the context of scapular trauma, the "floating shoulder" represents a highly unstable biomechanical state. While historical literature suggested that fixation of the clavicle alone might indirectly reduce the scapular neck via the intact CC ligaments, contemporary understanding dictates that if the scapula remains significantly displaced or angulated after clavicle fixation, direct open reduction and internal fixation of the scapula is absolutely mandatory to prevent chronic rotator cuff dysfunction.

In the proximal humerus, the indications for surgery are heavily influenced by the risk of avascular necrosis. Hertel’s radiographic criteria for predicting humeral head ischemia are a critical component of the preoperative assessment. A metaphyseal head extension (calcar length) of less than 8 mm, disruption of the medial hinge with greater than 2 mm of displacement, and true anatomic neck fracture patterns are highly predictive of AVN. In elderly patients presenting with these high-risk features, primary arthroplasty—specifically Reverse Total Shoulder Arthroplasty (RTSA)—has largely supplanted Open Reduction and Internal Fixation (ORIF) as the treatment of choice, offering more predictable pain relief and functional restoration without the risk of catastrophic hardware failure or secondary AVN.

Pre-Operative Planning, Templating, and Patient Positioning

Thorough pre-operative planning is the bedrock of successful shoulder girdle reconstruction. Standard radiographic trauma series must include an anteroposterior (AP) view, a true AP of the glenohumeral joint (Grashey view), a scapular Y view, and an axillary lateral view. The axillary lateral is non-negotiable, as it is the only view that definitively assesses the relationship of the humeral head to the glenoid and quantifies the anterior-posterior displacement of the tuberosities. In the setting of complex, comminuted fractures—particularly those involving the glenoid articular surface or multi-part proximal humerus fractures—a fine-cut Computed Tomography (CT) scan with 3D surface-rendered reconstructions is mandatory. 3D CT allows the surgeon to conceptualize the fracture lines, assess bone stock, and plan screw trajectories to avoid intra-articular penetration.

Digital templating is an essential step, particularly when utilizing pre-contoured locking plates or planning for arthroplasty. For proximal humerus fractures, the surgeon must template the contralateral, uninjured shoulder to determine the native humeral head height, the center of rotation, and the appropriate head size if a hemiarthroplasty is considered. When templating for a Reverse Total Shoulder Arthroplasty, evaluating the glenoid vault morphology and version is critical to ensure adequate baseplate seating and screw purchase. Pre-operative templating also dictates the necessary inventory, ensuring that specific implants, such as clavicle hook plates, specialized distal radius plates for fragment-specific fixation, or various arthroplasty stems, are available in the operating theater.

Patient positioning is dictated by the specific fracture and the planned surgical approach. For clavicle and proximal humerus fractures, the beach-chair position is universally preferred. The patient is positioned with the backrest elevated to 45-60 degrees. The head must be meticulously secured in a neutral position to prevent cervical spine hyperextension or lateral flexion, which can cause devastating brachial plexus traction injuries. The ipsilateral arm is draped completely free, utilizing a sterile arm positioner or a Mayo stand, to allow for dynamic manipulation, traction, and intraoperative fluoroscopy. The C-arm is typically brought in from the contralateral side or superiorly.

Conversely, for posterior approaches to the scapula, the lateral decubitus position is required. The patient is placed on a radiolucent beanbag, rolled 90 degrees, and secured with axillary rolls and judicious padding of all bony prominences. The operative arm is draped free and rested over a sterile Mayo stand or suspended with a specialized traction device. The surgeon must coordinate closely with the anesthesia team, as patients with severe scapular trauma frequently have underlying pulmonary contusions; the lateral decubitus position can exacerbate ventilation-perfusion mismatch if the uninjured lung is dependent.

Step-by-Step Surgical Approach and Fixation Technique

The operative execution of shoulder girdle trauma requires a profound respect for the soft tissue envelope, meticulous handling of delicate osteoporotic bone, and a comprehensive understanding of advanced osteosynthesis principles.

Clavicle Fixation Techniques

For midshaft clavicle fractures, the surgeon may utilize either an infraclavicular or a direct superior approach. The infraclavicular incision is often preferred as it minimizes postoperative irritation from backpack straps and allows for easier identification and preservation of the supraclavicular nerve branches. Dissection is carried down through the platysma, and the clavipectoral fascia is incised. It is critical to strip the periosteum minimally to preserve the fracture hematoma and local vascularity. The fracture is reduced using pointed reduction forceps. If the fracture pattern is a short oblique or transverse, an interfragmentary lag screw should be placed to achieve absolute stability. A pre-contoured locking compression plate is then applied. Anteroinferior plating offers distinct biomechanical advantages over superior plating: it allows for longer screw purchase in the narrowest dimension of the clavicle, reduces hardware prominence beneath the skin, and places the screws in a safe trajectory away from the subclavian neurovascular bundle.

For highly unstable distal clavicle fractures (Neer Type II), standard plating is often insufficient due to the lack of bone stock in the distal fragment. Specialized fixation is required. Options include the application of a clavicular hook plate, which leverages under the acromion to maintain reduction of the distal fragment. However, hook plates are associated with subacromial impingement and routinely require a secondary surgery for removal. A superior alternative is the use of a specialized distal clavicle locking plate combined with coracoclavicular ligament reconstruction using a suture-button device. This construct neutralizes the superior deforming forces on the medial clavicle while allowing the distal articular fragment to heal.

Scapula Fixation Techniques

Operative management of the scapula typically utilizes the classic or modified Judet (posterior) approach. With the patient in the lateral decubitus position, an L-shaped incision is made along the scapular spine and the medial border of the scapula. The deltoid is elevated off the scapular spine to expose the underlying infraspinatus and teres minor. The internervous plane between the infraspinatus (suprascapular nerve) and teres minor (axillary nerve) can be utilized, but for massive exposure, the infraspinatus is often elevated directly off the scapular body and retracted laterally. Extreme care must be taken to identify and protect the suprascapular nerve and vessels at the spinoglenoid notch.

Reconstruction begins with the articular surface. Intra-articular glenoid fractures are provisionally reduced with Kirschner wires and definitively fixed with 2.7-mm or 3.5-mm lag screws. Once the articular block is reconstituted, it must be secured to the axial skeleton. This is achieved by applying 2.7-mm or 3.5-mm reconstruction plates along the lateral border of the scapula, which represents the thickest bone pillar capable of holding screws. The medial border may also be plated if multi-planar instability exists. The very thin bone of the scapular body does not hold screws and is generally left alone once the structural pillars are restored.

Proximal Humerus Fixation Techniques

The deltopectoral approach is the undisputed workhorse for proximal humerus fractures. The internervous plane lies between the deltoid (axillary nerve) and the pectoralis major (medial and lateral pectoral nerves). The cephalic vein is identified and typically retracted laterally with the deltoid to preserve its venous drainage. The clavipectoral fascia is incised, and the conjoined tendon is retracted medially. The biceps tendon in the bicipital groove serves as the critical anatomical landmark, defining the interval between the greater and lesser tuberosities.

For Locking Plate Osteosynthesis (e.g., PHILOS), reduction is achieved via gentle traction, manipulation, and provisional pinning of the humeral head to the shaft. Heavy (#2 or #5) non-absorbable sutures are passed through the bone-tendon junction of the rotator cuff (supraspinatus, infraspinatus, subscapularis) to control the tuberosities. The locking plate is positioned lateral to the bicipital groove and 5 to 8 mm distal to the tip of the greater tuberosity to prevent subacromial impingement. Proximal locking screws are inserted. It is absolutely imperative to place inferomedial "calcar" screws; these screws act as a mechanical buttress to support the medial hinge and prevent catastrophic varus collapse of the humeral head. Finally, the previously placed tuberosity sutures are tied through the plate's dedicated suture holes to neutralize the deforming forces of the rotator cuff and compress the tuberosities to the shaft.

For valgus-impacted 4-part fractures, the articular surface is often preserved but driven down into the metaphysis. The "Parachute Technique" is employed: the articular segment is gently elevated using a Cobb elevator. The resulting metaphyseal void must be grafted with cancellous allograft or autograft to prevent subsidence. The construct is then secured with a locking plate, ensuring the tuberosities are anatomically reduced beneath the elevated head.

When the fracture is deemed un-reconstructible—such as head-splitting fractures or severe 4-part fractures with high ischemia risk in the elderly—arthroplasty is indicated. Hemiarthroplasty relies entirely on the anatomic healing of the tuberosities to the prosthesis for functional success. Precise height and retroversion (typically 20-30 degrees) are critical. However, Reverse Total Shoulder Arthroplasty (RTSA) has increasingly become the treatment of choice for elderly patients. RTSA medializes the center of rotation and distalizes the humerus, tensioning the deltoid and bypassing the need for tuberosity healing to achieve forward elevation. This offers significantly more predictable functional outcomes in osteoporotic bone.

Adjunctive Fragment-Specific Fixation

In complex polytrauma involving the upper extremity—such as a floating shoulder combined with an ipsilateral comminuted distal radius fracture or complex periarticular trauma—fragment-specific fixation principles must be employed. When addressing small, highly comminuted articular fragments (e.g., radial styloid or specific tuberosity fragments), standard locking plates may be too bulky and cause soft tissue impingement. In these instances, the application of a specialized pin-plate is required.

The technique involves undercontouring the plate to provide a spring-like effect when applied, ensuring dynamic compression against the cortical surface. The plate is positioned, and the proximal limb is secured with 2.3-mm or 2.7-mm screws. Application of screws through the distal limb of the plate is usually unnecessary, as the integrated pins will capture the distal fragment. The pin-plate is applied over the initial provisional Kirschner wires. It is vital to reflect overlying tendons and apply the plate directly on bone to prevent attritional tendon rupture. The construct is secured with proximal screws, and the distal wires are cut, bent, and impacted into the bone.

Complications, Incidence Rates, and Salvage Management

Despite meticulous surgical technique and advanced implant technology, the operative management of shoulder girdle trauma is fraught with potential complications. The surgeon must be prepared to identify and manage these adverse events promptly.

Varus collapse remains the most common mode of mechanical failure in proximal humerus plating. It occurs when the medial hinge is unsupported, allowing the pull of the rotator cuff to lever the humeral head into varus. This leads to secondary screw penetration into the glenohumeral joint. Prevention is paramount and is achieved by anatomic reduction of the medial calcar, the routine use of inferomedial locking screws, and heavy non-absorbable tension band suturing of the tuberosities to the plate. If secondary screw penetration occurs, prompt hardware removal is required to prevent rapid destruction of the glenoid cartilage.

Avascular necrosis can manifest even after a technically flawless ORIF, sometimes presenting up to two years post-operatively. If the patient develops symptomatic AVN with subchondral collapse, salvage typically requires conversion to arthroplasty. In younger patients with intact tuberosities, a hemiarthroplasty or anatomic total shoulder may be considered. In older patients or those with concomitant rotator cuff dysfunction, RTSA is the salvage procedure of choice.

Clavicular nonunions, while rare following primary ORIF, present a significant reconstructive challenge. They are typically atrophic and highly symptomatic. Management requires a meticulous revision surgery: the nonunion site must be radically debrided down to bleeding, healthy bone, the medullary canals opened, and the defect grafted with robust autologous cancellous bone (typically harvested from the anterior iliac crest). Fixation is achieved with a heavy-duty locking compression plate, often utilizing dual orthogonal plating if instability is profound.

Phased Post-Operative Rehabilitation Protocols

The ultimate success of shoulder girdle reconstruction is inextricably linked to a rigorous, well-structured, and patient-compliant postoperative rehabilitation protocol. The shoulder is inherently prone to stiffness; thus, the rehabilitation strategy must balance the competing demands of protecting the delicate fracture fixation while preventing adhesive capsulitis.

Phase I: Maximum Protection and Early Motion (Weeks 0-4)
Immediately post-operatively, the shoulder is immobilized in a sling or shoulder immobilizer. However, absolute immobilization is detrimental. Pendulum exercises and passive range of motion (PROM) in forward elevation and external rotation are initiated within the first 48 hours to prevent capsular contracture. The physical therapist must strictly control the limits of PROM based on intraoperative stability. Crucial Exception: If the lesser tuberosity was fractured and repaired, or if the subscapularis was taken down and repaired (as in arthroplasty), external rotation must be strictly limited to neutral or 10 degrees to prevent catastrophic failure of the anterior repair. Active motion of the elbow, wrist, and hand is encouraged immediately to reduce distal edema.

Phase II: Active-Assisted Motion and Callus Formation (Weeks 4-8)
At 4 to 6 weeks, radiographic evaluation should be performed to confirm early callus formation and the maintenance of hardware position without subsidence or screw cutout. Once early clinical stability is achieved, the patient is transitioned to active-assisted range of motion (AAROM) using pulleys, wand exercises, and wall walks. The sling is progressively weaned and discarded during the day. Isometrics for the deltoid and rotator cuff may be initiated in a pain-free range.

Phase III: Active Motion and Early Strengthening (Weeks 8-12)
By 8 weeks, assuming radiographic progression of healing, the patient initiates full active range of motion (AROM) in all planes. Progressive isotonic strengthening of the rotator cuff and periscapular stabilizers (rhomboids, trapezius, serratus anterior) is commenced using light resistance bands and weights. Scapulothoracic rhythm must be normalized, as dyskinesia is common following both clavicle and scapula fractures.

Phase IV: Advanced Strengthening and Return to Function (Weeks 12+)
Beyond 12 weeks, rehabilitation focuses on advanced strengthening, proprioception, and return to specific occupational or athletic demands. Return to heavy labor, overhead lifting, and contact sports is strictly contingent upon definitive radiographic union (bridging trabeculae across three cortices) and the restoration of symmetric shoulder strength and dynamic stability.

Summary of Landmark Literature and Clinical Guidelines

The modern operative management of shoulder girdle trauma is heavily guided by landmark prospective trials and established clinical guidelines.

For clavicle fractures, the Canadian Orthopaedic Trauma Society (COTS) multicenter randomized clinical trial fundamentally changed practice. The COTS trial demonstrated that operative fixation of completely displaced midshaft clavicle fractures significantly decreased the rate of nonunion (from 15% to <2%), improved early functional outcomes, and decreased the rate of symptomatic malunion compared to nonoperative sling immobilization. This established the current standard of care for displaced midshaft fractures in active individuals.

In the realm of proximal humerus fractures, the PROFHER (PROximal Fracture of the Humerus: Evaluation by Randomisation) trial challenged the widespread use of ORIF, suggesting no significant difference in clinical outcomes between surgical and non-surgical management for displaced fractures in the elderly. While controversial, the PROFHER trial highlighted the high complication rates of plating in osteoporotic bone and catalyzed the shift toward Reverse Total Shoulder Arthroplasty for complex 3- and 4-part fractures in the geriatric population. Furthermore, Hertel’s seminal paper on the predictors of humeral head ischemia remains the definitive guideline for assessing the risk of AVN and deciding between joint-preserving ORIF and primary arthroplasty.

Mastery of these operative techniques, combined with a profound respect for the soft tissue envelope, local biomechanics, and evidence-based guidelines, allows the orthopedic surgeon to navigate the extreme complexities of shoulder girdle trauma and restore optimal, pain-free function to the patient.