A patellar dislocation occurs when something exerts excessive force on the knee joint, often due to a sudden change in direction that causes a sideways twisting motion in the joint. Direct trauma to the knee joint can also cause the dislocation. The type of movements that result in kneecap dislocation most commonly occur when a person plays a sport involving rotation of the knee, such as gymnastics, soccer, and hockey. Weakness or tightness in the surrounding tissues can contribute, as can malformations in the knee joint.
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