About This Page
This is a clinician-written, evidence-based summary aligned to the USMLE Step 2 CK Content Outline. It is intended for medical students preparing for USMLE Step 2 CK. Management reflects current ACC/AHA, USPSTF, and APA guidelines. Always cross-reference with UpToDate, institutional protocols, and clinical judgment.
The Bottom Line
- Rotator cuff disease includes tendinopathy, impingement, partial tears, and full-thickness tears
- Supraspinatus is most commonly injured
- Painful arc, empty-can weakness, external rotation weakness, and drop-arm test guide diagnosis
- Most chronic atraumatic injuries start with PT and analgesia
- Acute traumatic full-thickness tear with weakness warrants early imaging/referral
Overview
Rotator cuff injury affects supraspinatus, infraspinatus, teres minor, and subscapularis tendons. Disease ranges from tendinopathy to full-thickness tears. True weakness after trauma is concerning.
Epidemiology
Common cause of shoulder pain. Risk rises with age, repetitive overhead work, throwing sports, smoking, diabetes, hyperlipidemia, and trauma.
Clinical Features
Symptoms
Lateral shoulder pain worse with overhead activity
Night pain lying on affected side
Painful arc 60-120 degrees
Weakness with abduction or external rotation after trauma
Sudden tearing sensation with inability to raise arm
Signs
Tenderness over greater tuberosity/subacromial region
Painful active ROM with preserved passive ROM
Empty-can weakness suggests supraspinatus
External rotation weakness suggests infraspinatus/teres minor
Drop-arm test suggests large tear
Investigations
First-line
Focused clinical assessmentPattern recognition, red flags, functional impact, and targeted examination
Basic labs when indicatedCBC, CMP, ESR/CRP, CK, urinalysis, or disease-specific testing depending on suspected condition
Initial imaging when indicatedPlain radiographs or MRI/ultrasound based on suspected structural, inflammatory, infectious, or neurologic disease
Second-line
Disease-specific confirmatory testingAutoantibodies, HLA-B27, synovial fluid, nerve conduction studies, DEXA, or cultures as appropriate
MRI/ultrasound/CTUsed for early inflammatory disease, occult fracture, tendon tear, infection, or surgical planning
Screening before immunosuppressionTB, hepatitis, vaccination review, and baseline labs when biologic or high-risk therapy is planned
Specialist
Specialist referralRheumatology, orthopedics, infectious disease, ophthalmology, neurology, or spine surgery depending on red flags and disease severity
1
Initial management
- Address red flags and emergencies first
- Use guideline-directed first-line therapy matched to disease severity
- Educate the patient and set functional goals
- Use analgesia and rehabilitation when appropriate
2
Escalation
- Escalate to specialist-directed therapy if severe, refractory, progressive, or organ-threatening disease
- Use imaging, procedures, immunosuppression, antibiotics, or surgery according to diagnosis
- Monitor response objectively and revise diagnosis if response is atypical
3
Prevention and follow-up
- Manage comorbidities and medication toxicity
- Vaccinate and screen when immunosuppression is used
- Prevent disability, falls, fracture, infection, and functional decline
Complications
- Functional impairment: Pain, weakness, stiffness, deformity, or disability depending on disease
- Diagnostic delay: Missed infection, fracture, inflammatory disease, neurologic compromise, or organ-threatening complication
- Medication toxicity: NSAID, steroid, antibiotic, anticoagulation, opioid, or immunosuppressive adverse effects
- Chronic disease burden: Reduced quality of life, work impairment, deconditioning, and mental health impact
USMLE Step 2 CK Exam Tips
- 1Active ROM limited but passive preserved = rotator cuff disease
- 2Both active and passive ROM limited = adhesive capsulitis or arthritis
- 3Supraspinatus is most commonly torn
- 4Drop-arm suggests full-thickness tear
- 5Acute traumatic inability to abduct = MRI/referral
- 6Initial chronic treatment = PT and NSAIDs
practicetest your knowledge on rotator cuff injuryApply what you've learnt with USMLE Step 2 CK-style questions from the iatroX Q-Bank — musculoskeletal and beyond.
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