What is a luxating patella?
The patella, or knee cap, should be located in the center of the knee joint. The term “luxating” means out of place or dislocated. Therefore, a luxating patella is a knee cap that moves out of its normal location. What causes this to occur? The muscles of the thigh attach directly or indirectly to the top of the knee cap. There is a ligament, called the patellar ligament, which runs from the bottom of the knee cap to a point on the tibia (shin bone) just below the knee joint. When the thigh muscles contract, the force is transmitted through the patella and through the patellar ligament and results in extension (straightening) of the knee joint. The patella stays in the center of the leg because the point of attachment of the patellar ligament is on the midline and because the patella slides in a groove on the lower end of the femur (the thigh bone). The patella luxates because the point of attachment of the patellar ligament is not on the midline of the tibia. It is almost always locat
