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Patellar Luxation in Cattle

By Paul R. Greenough, FRCVS, Professor Emeritus of Veterinary Surgery, Western College of Veterinary Medicine, University of Saskatchewan

Intermittent fixation of the patella on the upper part of the femoral trochlea results in a characteristic jerky action of one or both hindlimbs. The limb remains in caudal extension for a longer period than normal and may even be dragged for a few steps before clicking forward to a normal posture. In young animals, the condition may resolve spontaneously. For luxations that do not resolve, medial patellar desmotomy should be performed.