What is it?

Dislocation of knee, or patellar dislocation occurs when the knee cap pops sideways out of its knee joint groove. Normally, when we flex and extend the leg, the knee cap moves with the knee, thanks to tendons, ligaments and a bony structure that allows it. When an injury takes place, such as a sudden turn or twist to the knee, the knee cap pops out of its place, usually laterally. Rarely, patellar dislocation may happen gradually due to a condition called congenital patella dislocation. It is more common in athletes, dancers, teenagers, women, big and tall men and people with patellar instability.