## Overview Medial patellar instability contributes to upward fixation of the patella, in which the hind limb intermittently locks in extension. Weakness of the vastus medialis and straight hind-limb conformation are predisposing factors. Catching or clicking at the stifle is common. Quadriceps-strengthening exercises often help. ## Causes Poor quadriceps tone, straight hind-limb conformation, or ligamentous laxity. ## Diagnosis Observation of intermittent locking or catching, and manipulation of the patella. ## Treatment Conditioning (hill work, backing), improved fitness, and in refractory cases medial patellar ligament desmotomy or splitting. ## Recovery and Prognosis Good with conditioning in mild cases. Surgical cases also do well. ## Prevention Maintain hindquarter fitness, especially in young or unfit horses.
intermittent locking of the hind limb in extension; catching or clicking at the stifle; improves with quadriceps strengthening
## Overview Medial patellar instability contributes to upward fixation of the patella, in which the hind limb intermittently locks in extension. Weakness of the vastus medialis and straight hind-limb conformation are predisposing factors. Catching or clicking at the stifle is common. Quadriceps-strengthening exercises often help. ## Causes Poor quadriceps tone, straight hind-limb conformation, or ligamentous laxity. ## Diagnosis Observation of intermittent locking or catching, and manipulation of the patella. ## Treatment Conditioning (hill work, backing), improved fitness, and in refractory cases medial patellar ligament desmotomy or splitting. ## Recovery and Prognosis Good with conditioning in mild cases. Surgical cases also do well. ## Prevention Maintain hindquarter fitness, especially in young or unfit horses.
intermittent locking of the hind limb in extension; catching or clicking at the stifle; improves with quadriceps strengthening