Patellar Luxation in Cats
 
Patellar luxation occurs when the cat's kneecap (patella) is dislocated from its normal anatomic position in the groove of the thigh bone (femur). When the kneecap is dislocated from the groove of the thigh bone, it can only be returned to its normal position once the quadriceps muscles in the cat's hind legs relax and lengthen. Cats feel pain as the kneecap slides out of the thigh bone ridges, but do not feel any pain or discomfort once the kneecap has come to a rest out of the normal position.
 
Patellar luxation is thought to be quite rare in cats.
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