In patella infera the kneecap (patella) rides too low down the femur (thighbone).

 

Cause of patella infera

Inflammation of the anterior interval behind the patellar tendon may result in the tendon sticking down against the tibia, and the patella is pulled downwards.

Synonyms: 
Patella baja
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Dr Sheila Strover (Editor)
BSc (Hons), MB BCh, MBA

See biography...