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Patella Luxation

Chihuahua running free with a cured patella luxation

The medial luxating patella, commonly called a trick knee, is an extremely common problem in toy breed dogs. An owner typically notices a little skip in the dog’s step.

The dog may even run on three legs, holding one hind leg up, and then miraculously be back on four legs as if nothing has happened.

In fact, something has happened: the kneecap (patella) has slipped out of the smooth groove in which it normally rides up and down. It has slipped medially, which is to say towards the opposite leg, as opposed to laterally, which would be away from the dog entirely.

With the patella dislocated (or luxated) medially, the knee cannot extend properly and stays bent. With luck, the patient will be able to slip the kneecap back where it belongs and be back to normal in only a few steps.

For some dogs, getting a kneecap back where it belongs and normal extension of the rear leg is a mere dream only attainable with surgical correction.

Approximately 50 percent of affected dogs have both knees involved while the other 50 percent has only one knee involved.

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Patella Luxation

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