What is the appropriate treatment for a patient with a partial‑thickness infraspinatus tendon tear, large subacromial bursitis, glenoid changes, and absent superior humeral head articular cartilage?

Treatment Approach for Partial-Thickness Infraspinatus Tear with Glenohumeral Arthritis

Given the combination of absent superior humeral articular cartilage (indicating advanced glenohumeral osteoarthritis) with a partial-thickness rotator cuff tear, this patient requires surgical intervention, but traditional total shoulder arthroplasty is contraindicated—you should pursue arthroscopic management of the partial tear with subacromial decompression, followed by consideration of reverse shoulder arthroplasty if symptoms persist and functional demands warrant it.

Key Clinical Decision Point: The Articular Cartilage Loss Changes Everything

The presence of absent superior humeral articular cartilage with glenoid changes represents glenohumeral osteoarthritis, which fundamentally alters the treatment algorithm. This is not simply a rotator cuff problem—it's a combined pathology requiring careful surgical planning.

Why Traditional Approaches Don't Apply Here

• Total shoulder arthroplasty is contraindicated: The AAOS guidelines explicitly state by consensus that total shoulder arthroplasty should NOT be performed in patients with glenohumeral osteoarthritis who have rotator cuff pathology, as the cuff tear (even partial) compromises the biomechanics needed for standard arthroplasty success 1
• The partial-thickness tear, while significant, is occurring in the context of advanced joint degeneration, not as an isolated entity

Recommended Treatment Algorithm

Step 1: Initial Conservative Management (If Not Already Attempted)

• Single corticosteroid injection with local anesthetic for the subacromial bursitis and pain control—moderate evidence supports short-term improvement in pain and function 2
• Physical therapy focusing on maintaining range of motion and strengthening remaining intact rotator cuff musculature
• Avoid hyaluronic acid injections—limited evidence for rotator cuff pathology 2
• Do NOT use PRP for the partial tear—limited evidence does not support routine use 2

Step 2: Surgical Intervention When Conservative Fails

Given the combined pathology, a staged approach is most appropriate:

Primary Surgery: Arthroscopic Management

• Arthroscopic subacromial bursectomy to address the large bursitis
• Transtendon repair of the partial-thickness infraspinatus tear if >50% thickness involved—this technique preserves structural integrity and compresses the bursal layer onto bone while minimizing tension mismatch 3, 4
  • The switching-scope technique can improve visualization and reduce surgical time 4
  • Biomechanical studies show transtendon repair decreases glenohumeral and subacromial contact pressures, potentially reducing progression 5
• Address rotator interval fibrosis if present—articular-sided tears have higher incidence (69.6%) of rotator interval fibrosis that restricts glenohumeral motion 6
• Debridement of glenoid and humeral osteophytes as tolerated

Important Surgical Caveat

Do NOT perform conversion to full-thickness tear and standard repair in this patient—the underlying glenohumeral arthritis means the joint surface cannot support normal healing biology, and you risk accelerating joint destruction.

Step 3: Definitive Management If Symptoms Persist

If pain and dysfunction continue after arthroscopic management (which is likely given the cartilage loss):

• Reverse shoulder arthroplasty becomes the definitive treatment option
  • This addresses both the glenohumeral arthritis AND compensates for rotator cuff deficiency
  • The biomechanics of reverse arthroplasty do not depend on intact rotator cuff function
  • Patient age, activity level, and functional demands guide timing

Critical Pitfalls to Avoid

1. Don't treat this as isolated rotator cuff pathology: The absent articular cartilage is the dominant pathology affecting long-term outcomes and treatment selection

2. Don't perform hemiarthroplasty: Even if considering arthroplasty, the AAOS guideline shows moderate evidence favoring total shoulder over hemiarthroplasty for glenohumeral OA 1—but BOTH are contraindicated here due to the cuff tear

3. Don't use biological augmentation: Strong evidence does not support platelet-derived products for improving patient-reported outcomes in rotator cuff repair 2

4. Assess for comorbidities: Moderate evidence shows poorer outcomes in patients with comorbidities—diabetes, smoking, and other factors should be optimized preoperatively 2

5. Consider surgeon volume: Weak evidence suggests avoiding shoulder arthroplasty by surgeons performing <2 cases/year to reduce immediate postoperative complications 1

Prognostic Considerations

• Age matters: Strong evidence shows older age associates with higher failure rates and poorer outcomes after rotator cuff repair 2
• The combination of partial-thickness tear with advanced arthritis suggests this patient will likely progress to needing reverse arthroplasty regardless of initial arthroscopic intervention
• Set realistic expectations: Arthroscopic management may provide temporary symptom relief but is unlikely to be definitive given the cartilage loss

Rehabilitation Protocol

If arthroscopic repair is performed:

• Early mobilization is appropriate: Strong evidence shows similar outcomes between early and delayed mobilization up to 8 weeks for small-to-medium tears 2
• Focus on passive range of motion initially, then progressive strengthening
• Monitor closely for stiffness, particularly if rotator interval fibrosis was present 6