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

The filmy band is actually a fold in the capsule of the knee, but that is not appreciated in this illustration.

This illustration gives a better example of how the plica folds in from the capsule surrounding the knee joint.

Synonyms: 
Plica
Plica synovialis
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Link to an interesting discussion about plica surgery in the knee.

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.

Plicae

Part 7 of a course on Diagnostic Arthroscopy by Dr (Mr) Angus Strover

Medial plica

Plicae are often neglected as a cause of knee pain.

Pages

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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.