Patella dislocation usually occurs after a sudden change in direction when your leg is planted. Dislocation may also occur from a direct result of injury and is more likely to occur in women than men.
What Does Patella Dislocation Look Like?
Dislocation of the patella can make the knee appear deformed. The kneecap can slip around the outside of the knee and move around sideways. There may be intense pain and tenderness around the knee, and if the knee is bent it cannot straighten.