Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.
Displacement of the patella from its normal position in the femoral trochlea. Most patellar dislocations are marked by obvious deformity and occur laterally. They result in the tearing or stretching of the medial patellar retinaculum and the oblique fibers of the vastus medialis muscle. The patella may spontaneously reduce as the patient attempts to straighten the knee.
See also: patella