Overview

A subluxation is a partial dislocation. The kneecap (patella) can move out of its normal position more easily when the thigh muscles are weak or when the patella is not firmly held by the tendons and ligaments. This can also happen when there is a problem with the alignment or structure of the knee bones.

A patellar subluxation feels like the kneecap is shifting or jamming out of place. Usually, the kneecap returns to its normal position by itself. But if this keeps happening, it can damage the supportive tissues in and around the knee.