What is an appropriate muscle relaxant for a patient with a suspected rotator cuff tear?

Muscle Relaxants Are Not Recommended for Rotator Cuff Tears

Muscle relaxants have no established role in the treatment of rotator cuff tears and are not supported by clinical practice guidelines. The available evidence focuses on NSAIDs, corticosteroid injections, and physical therapy as the primary nonsurgical interventions—muscle relaxants are conspicuously absent from all major guidelines 1, 2.

Why Muscle Relaxants Are Not Indicated

The pathophysiology of rotator cuff tears involves tendon disruption, inflammation, and potential muscle atrophy—not primary muscle spasm 3. The pain originates from:

• Tendon pathology (partial or full-thickness tears, tendinosis) 3
• Subacromial bursal inflammation 3
• Glenohumeral joint instability from loss of rotator cuff integrity 3

Since the underlying problem is structural tendon damage rather than muscle spasm, muscle relaxants do not address the core pathology 4.

Evidence-Based Treatment Recommendations

First-Line Nonsurgical Management

The American Academy of Orthopaedic Surgeons guidelines provide clear direction for rotator cuff pathology without full-thickness tears 1:

• NSAIDs are suggested for initial treatment (moderate evidence) 1
• Exercise programs (supervised or home-based) are suggested (moderate evidence) 1
• Corticosteroid injections provide short-term pain relief and functional improvement (moderate to strong evidence) 2

For Confirmed Full-Thickness Tears

The evidence is more nuanced 1:

• NSAIDs, activity modification, ice, and heat cannot be definitively recommended for or against due to lack of quality evidence, but no harm has been demonstrated 1
• Corticosteroid injections show conflicting evidence—some studies show short-term benefit, others show no difference compared to lidocaine alone 1
• Exercise programs show inconclusive evidence but no adverse effects 1

Practical Treatment Algorithm

For suspected rotator cuff tear:

1. Start with NSAIDs (oral) for pain control 1
2. Initiate physical therapy focusing on rotator cuff and scapular stabilizer strengthening 5
3. Consider subacromial corticosteroid injection if pain limits function or therapy participation 2
4. Obtain MRI or ultrasound to confirm diagnosis and characterize tear (full vs partial thickness, size, muscle atrophy) 3, 2
5. Refer to orthopedics if full-thickness tear confirmed, especially if symptomatic despite conservative management 1

Critical Pitfalls to Avoid

• Do not prescribe muscle relaxants as they lack evidence and may cause sedation, falls risk, and dependency without addressing the underlying pathology 1
• Avoid delaying imaging if clinical suspicion is high—MRI and ultrasound have high sensitivity and specificity for rotator cuff tears 2
• Do not assume all shoulder pain is "muscle spasm"—rotator cuff tears require specific diagnosis and management 3
• Be cautious with multiple corticosteroid injections—theoretical concerns exist about adverse effects on tendon biology and healing, though quality evidence is lacking 1

Bottom Line

Use NSAIDs and physical therapy as your primary nonsurgical approach for rotator cuff pathology. Muscle relaxants have no role in this condition and divert attention from evidence-based treatments that actually address the underlying tendon pathology 1, 2.