What is the recommended treatment for a 30% supraspinatus tear with degenerative acromioclavicular joint hypertrophy?

Treatment for 30% Supraspinatus Tear with Degenerative AC Joint Hypertrophy

Initial conservative management with physical therapy is the recommended first-line treatment for a 30% (partial-thickness) supraspinatus tear with degenerative AC joint hypertrophy, as strong evidence supports that patient-reported outcomes improve with physical therapy in symptomatic rotator cuff pathology 1. Surgery should be reserved for patients who fail conservative treatment after an adequate trial period.

Initial Conservative Approach

For this partial-thickness tear, begin with:

• Structured physical therapy protocol for 3-6 months minimum, as strong evidence demonstrates improved outcomes with PT in symptomatic rotator cuff tears 1
• NSAIDs for pain management
• Activity modification to avoid overhead activities that exacerbate symptoms

The 2020 AAOS guidelines provide strong evidence that physical therapy improves patient-reported outcomes in symptomatic rotator cuff tears, though they note that tear size, muscle atrophy, and fatty infiltration may progress over 5-10 years with nonsurgical management 1. This is an acceptable trade-off for partial-thickness tears, as 77% of patients with degenerative supraspinatus tears achieve satisfactory outcomes without surgery 2.

Addressing the AC Joint Component

The degenerative AC joint hypertrophy should NOT be routinely addressed surgically, even if proceeding to rotator cuff repair. Here's why:

• Moderate strength evidence does not support routine acromioplasty or AC joint resection as concomitant treatment with rotator cuff repair for small-to-medium tears 1, 3
• A 2018 meta-analysis of RCTs found no difference in outcome scores, shoulder ROM, or reoperation rates when comparing rotator cuff repair plus distal clavicle resection versus isolated rotator cuff repair 4
• Importantly, distal clavicle resection may actually cause AC joint instability in patients with asymptomatic AC arthritis 4

The only exception: if the AC joint is independently symptomatic (positive cross-body adduction test, localized AC joint tenderness, pain relief with diagnostic injection), then consider addressing it. Otherwise, leave it alone.

When to Consider Surgery

Surgery becomes an option if conservative treatment fails after 3-6 months. Factors predicting failure of conservative treatment include 2:

• Younger age (mean 58.7 vs 64.8 years in surgical vs non-surgical groups)
• Manual laborers (62.5% vs 44.8% failure rate)
• Higher baseline pain and lower functional scores
• Previous contralateral shoulder surgery
• Larger sagittal tear dimensions (mean 14.7mm vs 13.5mm)

Surgical Approach If Needed

If surgery is indicated after failed conservative treatment:

1. Arthroscopic rotator cuff repair of the supraspinatus tear
2. Do NOT perform routine acromioplasty - moderate evidence shows no benefit 1, 3
3. Do NOT perform routine distal clavicle resection unless the AC joint is independently symptomatic 4

The evidence is clear: adding acromioplasty to rotator cuff repair provides no improvement in ASES scores, Constant-Murley scores, or DASH scores at 2-year follow-up 3. Similarly, distal clavicle resection adds no benefit and may cause harm through AC joint instability 4.

Important Caveats

• Age matters: Strong evidence shows older age is associated with higher failure rates and poorer outcomes after rotator cuff repair 1
• Tear progression: While conservative treatment is effective initially, rotator cuff tear size, muscle atrophy, and fatty infiltration may progress over 5-10 years 1
• Partial vs full-thickness: Your 30% tear is partial-thickness, which generally has better prognosis than full-thickness tears
• A recent 2021 RCT with 6.2-year follow-up found no significant difference between operative and conservative treatment for small, nontraumatic supraspinatus tears in patients >55 years, and operative treatment did not protect against glenohumeral OA or cuff tear arthropathy 5

Bottom Line Algorithm

1. Start with 3-6 months of structured physical therapy
2. Reassess at 3 months - if improving, continue conservative care
3. If failing at 6 months AND patient has high functional demands, consider surgery
4. If surgery: repair the rotator cuff only; skip the acromioplasty and AC joint resection unless AC joint is independently symptomatic
5. For patients >55 years with low functional demands, strongly consider continuing conservative management even if symptoms persist, as long-term outcomes are equivalent 5