Joint mouse

Last revised by Dr Daniel J Bell on 15 Dec 2021

A joint mouse (plural: joint mice) is a historical synonym for an intra-articular loose body. This evocative term predates the discovery of x-rays and originated in orthopedics. It derives from the way in which some intra-articular osteochondral fragments appeared to move rapidly around the inside of the joint like a frenetic scurrying mouse 1-3.

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