Scapula fractures are rare injuries accounting for <1% of all fractures and approximately 3–5% of shoulder girdle fractures. [1] They are a critical marker of high-energy trauma and should prompt a thorough search for associated life-threatening injuries. Approximately 81% are managed nonoperatively with sling immobilization and early rehabilitation. [1-2]
1. History
- Mechanism of injury is paramount: motor vehicle collision, motorcycle crash, fall from height, direct blow, or pedestrian struck. Motorcycle collisions are the most common mechanism in displaced fractures. [3]
- In the elderly, same-level falls are increasingly common and may cause glenoid rim or intra-articular fractures. [1][4]
- Characterize pain location (posterior shoulder, periscapular), severity, radiation, and ability to move the arm.
- Ask about numbness, tingling, or weakness in the ipsilateral arm (brachial plexus concern).
- Inquire about dyspnea, chest pain, or pleuritic symptoms (associated thoracic injury).
- Determine if there was loss of consciousness, head strike, or neck pain (concomitant head/spine injury).
- Rarely, patients with osteoporosis can sustain a scapula fracture without significant trauma. [5]
2. Alarm Features
- Scapulothoracic dissociation: lateral scapular displacement on chest radiograph with massive shoulder swelling, pulselessness, and brachial plexus deficit — this is an orthopedic emergency with vascular injury in up to 88% and neurologic injury in 94% of cases. [6-7]
- Absent or diminished radial pulse, expanding supraclavicular hematoma, or upper extremity ischemia → suspect subclavian/axillary artery injury. [8-9]
- Clavicular or scapular fractures are independent risk factors for traumatic subclavian vascular injury. [8]
- Associated pneumothorax (55–58%), pulmonary contusion (63%), rib fractures (40%), spine fractures (42%), and intracranial hemorrhage (32%) in high-energy pediatric series — similar patterns in adults. [10-11]
- Open fracture or impending open fracture.
- Hemodynamic instability suggesting ongoing hemorrhage.
3. Medications
- First-line analgesia: Oral NSAIDs (e.g., ibuprofen, ketorolac IV in ED) and/or acetaminophen. The ACP/AAFP guideline recommends oral NSAIDs or acetaminophen as first-line for acute musculoskeletal pain. The Orthopaedic Trauma Association supports routine NSAID use in fracture care, noting no conclusive clinical evidence that NSAIDs impair fracture healing. [12-13]
- Topical NSAIDs (e.g., diclofenac gel) are effective and have fewer systemic side effects. [14]
- Ultrasound-guided suprascapular nerve block in the ED is a highly effective analgesic intervention, reducing pain scores from a mean of 8.9 to 2.9 within 30 minutes. [15]
- Opioids should be reserved for severe or refractory pain and used short-term. Avoid prolonged prescriptions (>7 days increases risk of prolonged use). [14]
- Avoid anticoagulants acutely if surgical intervention is anticipated; coordinate with surgical team.
- Muscle relaxants have limited evidence for this specific injury.
4. Diet
- No specific dietary restrictions.
- Ensure adequate calcium and vitamin D intake for bone healing, particularly in elderly or osteoporotic patients.
- Adequate protein intake supports fracture healing.
- Maintain hydration, especially if on NSAIDs.
5. Review of Systems
- Respiratory: Dyspnea, pleuritic chest pain, cough (pneumothorax, hemothorax, pulmonary contusion).
- Neurologic: Numbness, tingling, weakness in ipsilateral arm/hand (brachial plexus injury).
- Vascular: Coolness, color change, or swelling of ipsilateral arm (vascular injury).
- MSK: Neck pain, back pain, ipsilateral chest wall pain, other extremity pain (associated fractures).
- Neuro/Head: Headache, LOC, confusion (concomitant TBI).
- Abdominal: Pain, distension (polytrauma screening).
6. Collateral History and Family History
- Collateral from EMS or witnesses regarding mechanism, speed, ejection, rollover, height of fall, or direct blow.
- Pre-existing shoulder pathology, prior fractures, or osteoporosis history.
- Family history of osteoporosis or connective tissue disorders (if low-energy mechanism).
- Functional baseline and hand dominance.
- Social context: occupation (manual labor vs. sedentary), recreational activities, substance use (alcohol/drug use contributing to mechanism).
7. Risk Factors
- High-energy trauma: MVC, motorcycle collision, fall from height, direct crush injury. [1][4]
- Male sex (64% of scapula fractures). [1]
- Mean age 58 years in population-based data, with increasing incidence in the 60–80+ age group due to falls. [1][4]
- Osteoporosis (low-energy fractures in elderly). [5]
- Motorcycle use (most common mechanism for displaced fractures). [3]
- Contact sports, industrial accidents.
8. Differential Diagnosis
- Rotator cuff tear — pain with overhead motion, weakness on specific testing; no bony tenderness.
- Proximal humerus fracture — tenderness over proximal humerus, ecchymosis tracking to arm.
- Clavicle fracture — palpable deformity, tenderness along clavicle.
- Acromioclavicular separation — step-off deformity at AC joint.
- Rib fractures — point tenderness over ribs, pain with respiration.
- Glenohumeral dislocation — loss of deltoid contour, arm held in specific position.
- Scapulothoracic dissociation — the cannot-miss diagnosis; lateral scapular displacement with neurovascular compromise. [6][16]
- Thoracic spine fracture — midline tenderness, neurologic deficits.
- Myocardial contusion or aortic injury — in high-energy blunt chest trauma.
9. Past Medical History
- Prior shoulder injuries, dislocations, or surgeries.
- Osteoporosis or osteopenia (pathologic fracture risk). [5]
- Prior fractures or bone disease.
- Anticoagulant or antiplatelet use (bleeding risk with associated injuries).
- Chronic lung disease (relevant if pneumothorax develops).
- History of reverse total shoulder arthroplasty (acromion stress fractures are a known complication). [2]
10. Physical Exam
- Vital signs: Tachycardia and hypotension suggest hemorrhage from associated injuries.
- Inspection: Posterior shoulder swelling, ecchymosis, abrasions. Massive shoulder swelling raises concern for scapulothoracic dissociation. [6]
- Palpation: Tenderness over scapular body, spine, acromion, coracoid. Palpate clavicle and AC joint for concomitant injury.
- Neurovascular exam: Radial, ulnar, and brachial pulses; capillary refill; sensation in all dermatomes of the upper extremity (axillary, musculocutaneous, median, ulnar, radial nerves). Motor testing of deltoid, biceps, wrist extensors, grip, and intrinsics.
- Chest exam: Auscultate for decreased breath sounds (pneumothorax/hemothorax), chest wall crepitus, rib tenderness.
- Cervical spine: Midline tenderness, range of motion (if cleared).
- Range of motion: Typically severely limited by pain; do not force.
11. Lab Studies
- Type and screen if high-energy mechanism or hemodynamic instability.
- CBC — baseline hemoglobin for hemorrhage monitoring.
- BMP — renal function (relevant for NSAID use and contrast if CT angiography needed).
- Lactate — marker of tissue hypoperfusion in polytrauma.
- Coagulation studies if on anticoagulants or if surgical intervention anticipated.
- Troponin if concern for myocardial contusion in high-energy blunt chest trauma.
- No specific lab is diagnostic for scapula fracture itself.
12. Imaging
- First-line: Shoulder radiographs — AP (internal and external rotation), axillary view, and scapular Y view. Note: scapula fractures are frequently missed on plain radiographs, with 60–73% seen only on CT. [11][17-18]
- CT shoulder without contrast is the gold standard for characterizing scapula fracture patterns, assessing intra-articular extension, glenopolar angle, angulation, and lateral border offset. The ACR Appropriateness Criteria rates CT as the best modality for scapula fracture characterization. [17][19]
- CT chest (often already obtained in trauma pan-scan): Evaluates for pneumothorax, hemothorax, pulmonary contusion, rib fractures, and spine fractures.
- CT angiography of the chest/upper extremity: If concern for vascular injury (absent pulse, expanding hematoma, scapulothoracic dissociation). [6][8]
- Chest radiograph: Assess for lateral scapular displacement (scapular index) to evaluate for scapulothoracic dissociation. [6][20]
- The "spike sign" on AP shoulder radiograph — lateral border displacement beyond the glenoid — has a 100% positive predictive value for meeting surgical indications in extraarticular fractures. [3]
13. Special Tests
- Scapular index: Ratio of distances from midline to medial scapular border on each side on a nonrotated AP chest radiograph. Asymmetry suggests scapulothoracic dissociation. [6][20]
- Glenopolar angle (GPA): Measured on CT; GPA <20° suggests surgical indication for neck/body fractures. [2]
- Lateral border offset: >10 mm (medialization) on CT suggests surgical indication. [2]
- Sagittal angulation: >40° suggests surgical indication. [2]
- Glenoid articular displacement: >4 mm or involvement of >30% of joint surface suggests surgical indication for glenoid fractures. [2]
- Point-of-care ultrasound (POCUS): E-FAST for pneumothorax/hemothorax; can also guide suprascapular nerve block. [15]
- Ankle-brachial index (ABI) or arterial Doppler if vascular injury suspected.
14. ECG
- Obtain ECG in high-energy blunt chest trauma to evaluate for:
- Myocardial contusion (ST changes, new arrhythmias, conduction abnormalities).
- Traumatic pericardial effusion (low voltage, electrical alternans).
- Not routinely indicated for isolated low-energy scapula fractures.
15. Assessment
Scapula fractures are rare but clinically significant injuries. The most common fracture types are glenoid rim (32%) and scapular body (28%). [1] High-energy mechanisms account for ~22% of cases, and 21% have at least one associated fracture (most commonly clavicle and proximal humerus). [1] Associated thoracic injuries (rib fractures, pneumothorax, pulmonary contusion) are common and often drive morbidity more than the scapula fracture itself. [11] The 1-year mortality rate is approximately 4%, largely driven by associated injuries rather than the fracture itself. [1]
Severity stratification:
- Nondisplaced, extra-articular: Low severity; nonoperative management.
- Displaced body/neck fractures meeting CT criteria: Moderate-high severity; orthopedic consultation for possible surgery.
- Intra-articular glenoid fractures: Higher surgical rate (~30%). [1]
- Scapulothoracic dissociation: Emergent, limb- and life-threatening. [6][16]
16. Treatment Plan
Initial stabilization (ED)
- ABCs and ATLS approach for high-energy trauma.
- Sling or shoulder immobilizer for comfort. [5][21]
- Multimodal analgesia: NSAIDs + acetaminophen as first-line. Consider ultrasound-guided suprascapular nerve block for severe pain. [12-13][15]
- Ice application for swelling.
Nonoperative management (majority of cases)
- Sling immobilization for 2–4 weeks until acute pain resolves. [5]
- Early pendulum exercises and progressive rehabilitation.
- Nonoperative treatment is the gold standard for most fracture patterns. [1-2]
Surgical indications (evaluated on CT): [2-3]
- Glenopolar angle <20°
- Frontal displacement (medialization) >10 mm
- Sagittal angulation >40°
- Intra-articular glenoid displacement >4 mm or >30% joint surface involvement
- Persistent glenohumeral subluxation
- Double disruption of the superior shoulder suspensory complex
- Open fractures or neurovascular compromise
Vascular injury management: Emergent surgical or endovascular repair for limb-threatening ischemia. [6][22]
17. Disposition
- Admit if:
- High-energy mechanism with associated injuries (pneumothorax, hemothorax, pulmonary contusion, vascular injury, TBI, spine fracture). [11]
- Hemodynamic instability.
- Scapulothoracic dissociation. [6][16]
- Need for surgical intervention.
- Inadequate pain control.
- Discharge if:
- Isolated, nondisplaced scapula fracture with adequate pain control.
- No associated thoracic or neurovascular injuries.
- Reliable follow-up arranged.
- Observation may be appropriate for isolated fractures with borderline pain control or mild associated injuries.
- Consult orthopedic surgery for displaced fractures, intra-articular involvement, or positive spike sign on radiograph. [3]
- Consult trauma surgery for polytrauma or vascular injury.
18. Follow Up / Return Precautions
- Orthopedic follow-up within 1–2 weeks for repeat imaging and reassessment of fracture alignment.
- CT may be obtained at follow-up if not done in the ED, particularly for fractures near the glenoid or with significant displacement. [17]
- Begin gentle range-of-motion exercises (pendulums) at 2–4 weeks as pain allows. [2][5]
- Progressive strengthening at 6–8 weeks; full recovery typically 3–6 months.
Return precautions — instruct patients to return immediately for:
- Increasing shortness of breath or chest pain (delayed pneumothorax/hemothorax).
- New numbness, tingling, or weakness in the arm or hand.
- Increasing swelling, coolness, or color change of the arm.
- Fever or signs of infection (if open wound).
- Worsening pain despite medications.
Patient counseling: Most scapula fractures heal well with conservative management. Emphasize the importance of early gentle motion to prevent stiffness, adherence to follow-up, and avoidance of heavy lifting or overhead activity until cleared by orthopedics.
References
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2. Articular and Extra-Articular Scapula Fracture. — Villatte G, Antoni M, Girard M, Marcheix PS. Orthopaedics & Traumatology, Surgery & Research : OTSR. 2025.
3. Could the Scapular Spike Sign Be Used as a Radiographic Proxy for Surgical Indications?. — Brahme IS, Shaikh H, Bober K, et al. Clinical Orthopaedics and Related Research. 2026.
4. Injury Mechanism, Epidemiology, and Hospital Trends of Scapula Fractures: A 10-Year Retrospective Study of the National Trauma Data Bank. — Tatro JM, Schroder LK, Molitor BA, Parker ED, Cole PA. Injury. 2019.
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9. The Clinical Diagnosis of Ruptured Subclavian Artery Following Blunt Thoracic Trauma. — Sturm JT, Cicero JJ. Annals of Emergency Medicine. 1983.
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15. Suprascapular Nerve Block for Analgesia in Traumatic Scapular Fractures Performed by Emergency Physicians: A Case Series. — Bhoi S, Chanda A. The American Journal of Emergency Medicine. 2025.
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20. Traumatic Lateral Displacement of the Scapula: A Radiographic Sign of Neurovascular Disruption. — Oreck SL, Burgess A, Levine AM. The Journal of Bone and Joint Surgery. American Volume. 1984.
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