Scapula Fractures: A Comprehensive Clinical Overview

Scapula fractures are uncommon but clinically significant injuries, typically associated with high-energy trauma and a high incidence of concomitant injuries.

Epidemiology

Scapula fractures are relatively rare:

• Account for 3%–5% of all shoulder fractures
• Represent 0.4%–1% of all fractures
• Most commonly affect individuals aged 35–45 years

Their rarity is largely due to the scapula’s protected anatomical position.

Anatomy

The scapula is a flat, triangular bone that connects the upper limb to the axial skeleton. Key features include:

• Mobility over the thoracic wall, which dissipates force
• Surrounding muscle envelope, providing additional protection
• Important articulations: glenohumeral joint and acromioclavicular joint

See Also: Scapula Anatomy

Mechanism of Injury

Scapula fractures usually result from high-energy trauma:

Common causes:

• Motor vehicle accidents (~50%)
• Motorcycle accidents (11%–25%)

Injury patterns:

• Indirect trauma: axial loading through an outstretched arm → glenoid or neck fractures
• Direct trauma: blow to the back or shoulder → scapular body fractures
• Shoulder dislocation: may cause glenoid fractures
• Avulsion injuries: caused by ligament or muscle pull

Associated Injuries

Scapula fractures are highly associated with other serious injuries (35%–98%):

• Thoracic injuries:
  • Rib, clavicle, and sternum fractures
  • Pneumothorax (11%–55%)
  • Pulmonary contusion (11%–54%)
• Neurovascular injuries:
  • Brachial plexus injuries
  • Vascular damage
• Spinal injuries:
  • Cervical (20%)
  • Thoracic (76%)
  • Lumbar (4%)

⚠️ The presence of a scapula fracture should always trigger a full trauma evaluation.

Clinical Evaluation

Initial assessment:

Follow ATLS principles:

• Airway
• Breathing
• Circulation
• Disability
• Exposure

Typical presentation:

• Arm supported by the opposite hand
• Limited shoulder motion, especially abduction
• Significant pain

Key clinical signs:

• Comolli sign: triangular swelling over the posterior scapula → suggests hematoma
• Rule out compartment syndrome (rare but serious)

Essential examination:

• Thorough neurovascular assessment
• Evaluation for associated injuries

Radiographic Evaluation

Initial imaging:

• Often first detected on chest X-ray
• Standard trauma shoulder series:
  • Anteroposterior (AP) view
  • Axillary view
  • Scapular-Y view

Additional imaging:

• CT scan: essential for intra-articular glenoid fractures
• Stryker notch view: useful for coracoid fractures

Important differentials:

• Os acromiale (normal variant)
• Glenoid hypoplasia

Scapula Fractures Classification

1. Anatomic Classification (Zdravkovic & Damholt Classification)

• Type I: Scapular body
• Type II: Apophyseal (acromion, coracoid)
• Type III: Fractures of the superolateral angle, including the scapular neck and glenoid

2. Ideberg Classification (Glenoid Fractures)

3. Kuhn Classification for Acromial Fracture

4. Ogawa classification for Coracoid Fracture

• Type I: Fracture occurs proximal to coracoclavicular ligaments
• Type II: Fracture occurs towards the tip of the coracoids

Scapula Fractures Treatment

Nonoperative Management (Most Cases)

• Sling immobilization
• Early range-of-motion exercises
• Indicated for most extra-articular fractures

Operative Management

Indications include:

• Intra-articular glenoid fractures (>25% involvement)
• Articular step-off >5 mm
• Scapular neck:
  • 40° angulation
  • 1 cm medial displacement
• Displaced acromion causing impingement
• Coracoid fractures with AC joint instability
• “Floating shoulder” injuries

Floating Shoulder

A double disruption of the Superior Shoulder Suspensory Complex (SSSC):

• Includes:
  • Glenoid
  • Coracoid
  • Clavicle
  • AC joint

Clinical relevance:

• May cause instability and functional impairment
• Glenopolar angle <30° → poorer outcomes

Management remains controversial, but both operative and nonoperative approaches can yield good results.

Surgical Considerations

Positioning:

• Lateral (common for body/neck fractures)
• Supine or beach chair (depending on approach)

Surgical approaches:

• Anterior (deltopectoral): glenoid/coracoid
• Posterior (Judet approach): body/neck
• Superior: acromion

Complications

• Associated injuries (major source of morbidity/mortality)
• Malunion:
  • Usually well tolerated
  • May cause scapulothoracic crepitus
• Nonunion:
  • Rare
  • May require surgical fixation
• Suprascapular nerve injury:
  • Especially in fractures involving the suprascapular notch

Key Takeaways

• Scapula fractures are rare but serious markers of high-energy trauma
• Always evaluate for life-threatening associated injuries
• Most fractures are treated nonoperatively
• Surgical intervention depends on displacement, instability, and joint involvement

References & More

1. Libby C, Frane N, Bentley TP. Scapula Fracture. [Updated 2023 Jul 17]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2026 Jan-. Available from: Pubmed
2. Mavrotas J, Fischer J. Scapula fractures: functional anatomy, clinical assessment and management. Br J Hosp Med (Lond). 2024 Mar 2;85(3):1-8. doi: 10.12968/hmed.2023.0351. Epub 2024 Mar 27. PMID: 38557096. Pubmed
3. Egol KA. Handbook of fractures. 6th ed. Philadelphia: Lippincott Williams & Wilkins; 2019.