Patella Subluxation & Dislocation

Patella subluxation and patella dislocation are two conditions in which there is a problem with the patella tracking in the groove on the end of the femur. Subluxation refers to minor slippage or partial movement of the patella out of the femoral groove; a dislocation occurs when the patella moves or is moved to the outside of this groove and onto the bony head of the femur (femoral condyle). It is usually the result of a sudden blow or twisting action of the knee.