Patella dislocation is a common injury in adolescents, particularly in those playing sports. Most commonly, the patella dislocates laterally to the outside of the knee. This process often injures tissues on the medial or inside of the knee, such as the medial patellofemoral ligament (MPFL). Dislocation can be divided into two categories: primary (first-time) and secondary (second, third, etc). It may also be categorised as traumatic (involving significant force to dislocate the patella from its resting groove) or atraumatic.