USMLE Step 1 Musculoskeletal: 10 High-Yield Practice Questions
Musculoskeletal questions on Step 1 tend to favor anatomy, connective tissue disorders, and bone pathology. They're predictable if you know the high-yield patterns. Here are 10 questions modeled on actual Step 1 style — work through them before checking the explanations.
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Evidence-based · For exam prep, not medical advice
update Updated October 2026
Date of last content change
Built by surgery and anesthesiology residents·Written for USMLE Step 1
High-Yield Topics Covered
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Collagen types and associated disorders
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Bone tumors by age and location
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Compartment syndrome vs. acute limb ischemia
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Rotator cuff anatomy and injury patterns
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Osteochondroses (Osgood-Schlatter, Legg-Calvé-Perthes)
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Crystal arthropathies (gout vs. pseudogout)
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Septic arthritis management
Question 1 of 5Score: 0 / 0
Q1Osteochondroses
A 14-year-old male presents with knee pain that worsens with running and jumping. He plays football. On exam, there is point tenderness over the tibial tubercle. X-ray shows fragmentation of the tibial apophysis. What is the most likely diagnosis?
Explanation: Osgood-Schlatter disease: apophysitis of the tibial tubercle in adolescent athletes. The patellar tendon repeatedly pulls on the developing apophysis during quadriceps-demanding activities (running, jumping). Classic presentation: teenage male, tibial tubercle tenderness, activity-related pain. Management is rest and activity modification.
Q2Crystal Arthropathies
A 55-year-old man with a history of gout presents with severe pain in his right knee. Aspiration reveals positively birefringent, rhomboid-shaped crystals. What is the most likely diagnosis?
Explanation: Pseudogout (calcium pyrophosphate deposition): positively birefringent, rhomboid-shaped calcium pyrophosphate crystals on polarized light microscopy. In contrast, gout features negatively birefringent, needle-shaped monosodium urate crystals. Pseudogout most commonly affects the knee; gout most commonly affects the 1st MTP joint.
Q3Bone Tumors
A 17-year-old presents with a painful swelling near the distal femur. X-ray shows a lesion with 'sunburst' pattern and Codman's triangle. What is the most likely diagnosis?
Explanation: Osteosarcoma: most common primary bone malignancy in adolescents. Classic radiographic findings: sunburst pattern (periosteal new bone formation) and Codman's triangle (elevated periosteum). Most common around the knee (distal femur, proximal tibia). Associated with prior radiation, Paget disease, and Li-Fraumeni syndrome (p53 mutation).
Q4Connective Tissue
A patient with Marfan syndrome undergoes a workup. Which type of collagen is primarily defective in this condition?
Explanation: Marfan syndrome is caused by a mutation in FBN1 (fibrillin-1), a glycoprotein involved in elastic fiber scaffolding — not a collagen defect. Fibrillin-1 supports connective tissue in the aorta, lens zonules, and skeletal structures. Common Step 1 trap: fibrillin ≠ collagen.
Q5Compartment Syndrome
A patient presents with severe forearm pain after a crushing injury. Pain is exacerbated by passive stretch of the fingers. Pulses are intact. What is the most appropriate next step?
Explanation: This is compartment syndrome: elevated intracompartmental pressure compromising perfusion. Classic 6 P's: Pain (out of proportion, worse with passive stretch), Pressure (tense compartment), Paresthesias, Pallor, Paralysis, Pulselessness (late). Intact pulses do NOT rule out compartment syndrome. Treatment is emergent fasciotomy — do not delay for imaging.
What are the most common bone tumors tested on USMLE Step 1?
Know by age and location: children (Ewing sarcoma — diaphysis, 'onion skinning'), adolescents (Osteosarcoma — metaphysis, distal femur, 'sunburst'), adults 20–40 (Giant cell tumor — epiphysis, 'soap bubble'), Paget's disease age (secondary osteosarcoma). Osteochondroma is the most common benign bone tumor overall.
How do you differentiate gout from pseudogout on USMLE?
Gout: monosodium urate, needle-shaped, negatively birefringent (yellow when parallel to compensator). Pseudogout: calcium pyrophosphate, rhomboid-shaped, positively birefringent (blue when parallel). Location: gout → 1st MTP; pseudogout → knee. Mnemonic: 'Gout is Negative (negative birefringence) and goes to your big toe (1st MTP).'
When should I study musculoskeletal for Step 1?
Most students underweight MSK — it comprises approximately 10% of Step 1. Focus on bone tumors, crystal arthropathies, collagen disorders, and anatomy (rotator cuff, brachial plexus, common nerve injury patterns). The MSK section of First Aid plus UWorld MSK is the high-yield combination.
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