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Ans
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Reading File
Finding Sources
Correct answer: 367127 — Bucket-handle tear
A bucket-handle tear is a longitudinal vertical tear of the meniscus where a large inner fragment detaches but stays hinged at both the anterior and posterior horns (like the handle of a bucket). This displaced fragment can flip into the intercondylar notch and mechanically block full extension, producing the classic locked knee — the patient cannot fully straighten the knee, often with a springy block to extension.
Why the others don't fit:
- Anterior/posterior horn tears — isolated horn tears don't typically produce a displaceable fragment large enough to jam the joint, so locking is uncommon.
- Radial tear — runs perpendicular to the meniscal circumference; it disrupts hoop-stress fibers but doesn't create a mobile fragment that lodges in the notch, so it doesn't classically cause true locking.
This is confirmed across multiple sources:
- Campbell's Operative Orthopaedics, 15th Ed: "a bucket-handle meniscal tear... The patient typically has episodes of locking in which the knee can be neither fully [extended nor flexed]."
- Rheumatology (Elsevier, 2022): "A locked knee can result from a large or bucket handle type meniscal tear displacing within the joint."
- Grainger & Allison's Diagnostic Radiology: "...fragment which may cause locking; this is particularly common with longitudinal tears, which... can give rise to a 'bucket handle' tear."
So your candidate response tray shows the correct option is indeed 367127 (Bucket handle tear).
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