The patellar retinaculum is the fibrous material at the sides of the patella, that act to stabilise it.

retinaculum supporting the patella
The retinaculum is a fine but strong sheet communicating between the patella and the muscles and other supportive structures around the knee.
Synonyms: 
lateral retinaculum
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CLINICAL PUBLICATIONS

A new minimally invasive surgical technique for medial retinaculum repair following traumatic patellar dislocation. Shtarker H, Assaf M and Deltoff MN. Eur J Orthop Surg Traumatol. 2018; 28(5): 811–817.


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