A synovial plica is a membrane related to the joint lining or synovium and which can stretch across the knee cavity.

Four synovial plicae are commonly recognised:

medial plica from the side nipped plica
Synonyms: 
Plica
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50 KNEEtalk spotlights - #03

A list of references relating to the plica syndrome

What is the Plica Syndrome?

The plica syndrom is an often-missed cause of symptoms around the kneecap.

A case presentation by Mr Angus Strover.

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CLINICAL PUBLICATIONS

Synovial Plica Syndrome of the Knee: A Commonly Overlooked Cause of Anterior Knee Pain. Lee et al. Surg J (N Y). 2017 Jan; 3(1): e9–e16.

Medical Plica Syndrome Sznajderman T. et al. IMAJ 2009: 1: January: 54-57.

Synovial Plicae in the Knee Boles CA and Martin DF. American Journal of Roentgenology. 2001;177: 221-227.