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Locked knee — MRCEM SBA MCQ

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ModerateKnee InjuriesLocked kneeMRCEM SBA

A 35-year-old footballer has a true locked knee after twisting, with inability to fully extend and a moderate effusion. What is the most appropriate investigation?

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Correct answer: E — MRI knee with urgent orthopaedic referral

A true locked knee suggests a displaced meniscal tear or loose body. MRI helps define the mechanical block and associated injuries. Urgent specialist review is appropriate because repair options may be time-sensitive.

Reference: NICE CKS; Brukner & Khan