How should an intracapsular proximal humeral fracture be managed?

Management of Intracapsular Proximal Humeral Fractures

Most intracapsular proximal humeral fractures should be managed nonoperatively with active rehabilitation, as they achieve good functional outcomes in the majority of patients, particularly in elderly individuals 1, 2.

Initial Diagnostic Approach

Start with standard shoulder radiographs including AP views in internal and external rotation plus an axillary or scapula-Y view 3. These views are essential—AP views alone can miss critical displacement patterns and joint relationships.

If radiographs show a complex or comminuted fracture pattern where surgical decision-making requires better characterization, obtain CT without contrast, which changes management in up to 41% of proximal humeral fractures by revealing fracture morphology that radiographs cannot adequately demonstrate 3.

Treatment Decision Algorithm

Nonoperative Management (First-Line for Most Fractures)

Treat conservatively if:

• Undisplaced or minimally displaced fractures
• Elderly patients with low functional demands
• Adequate bone quality for healing
• No biomechanical instability

This represents the majority of intracapsular proximal humeral fractures 4, 5.

Operative Management Indications

Consider surgery for:

Younger/active patients with:

• Displaced 2-part, 3-part, or 4-part fractures
• Fracture-dislocations with head-split patterns
• Metaphyseal head extension <8mm (calcar length)
• Disrupted medial hinge
• Angular displacement >45 degrees 6, 7

Surgical options based on fracture pattern:

1. Open reduction and internal fixation (ORIF) for:

   • Reconstructable fractures in younger patients
   • Adequate bone quality
   • Preserved humeral head vascularity

   Critical technical points: Restore the medial calcar anatomically and avoid residual varus displacement—these are the primary predictors of fixation failure 4.

2. Reverse total shoulder arthroplasty for:

   • Elderly patients (typically >65-70 years) with severely displaced 3-part or 4-part fractures
   • Fractures extending into the proximal shaft
   • Pre-existing rotator cuff dysfunction
   • Non-reconstructable fracture patterns 7, 5

Critical Predictors of Humeral Head Ischemia

Assess these factors as they predict avascular necrosis risk with up to 97% accuracy when combined 6:

• Calcar (metaphyseal head extension) length <8mm (accuracy 0.84)
• Disrupted medial hinge (accuracy 0.79)
• Combined fracture patterns (Neer types 2,9,10,11,12) (accuracy 0.70)

When these three criteria are present together, strongly consider primary arthroplasty over ORIF, as ischemia risk is extremely high 6.

Common Pitfalls to Avoid

With ORIF:

• Accepting residual varus displacement—this promotes fixation failure
• Inadequate restoration of medial column support
• Attempting fixation in severe osteoporosis (high complication rates)
• Nonanatomic reduction 4

With arthroplasty:

• Delayed intervention in appropriate candidates (early surgery improves outcomes)
• Poor tuberosity positioning (critical for rotator cuff function and outcomes) 7

Special Consideration: Osteoporosis

Intracapsular proximal humeral fractures serve as sentinel events for underlying osteoporosis 8. Initiate osteoporosis evaluation and treatment concurrently with fracture management, regardless of treatment modality chosen.