A facet is one of the flat surfaces at the back of the kneecap (patella).

 

Patellar facets

Although one talks mostly of a medial and a lateral facet, the patella has in fact seven facets - the medial and lateral facets are each divided into three parts and there is a seventh facet (the odd facet) medial to the others.

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Dr Sheila Strover (Editor)
BSc (Hons), MB BCh, MBA

See biography...