Patellar dislocation is an injury in which the kneecap protrudes from the intercondylar furrow. In order for dislocation to occur, there must be an additional cause (trauma) or pathology in the anatomy of the knee joint, which may include, among others, lateral positioning of the tibial tuberosity, bone development disorders (patellofemoral dysplasia), generalized joint laxity, previous knee injury , deformity of the foot or ante-thigh bone ante. The knee joint is most prone to patellar dislocation at the moment of internal rotation of the thigh in relation to the foot set on the ground, as well as flexion and deformation of the knee with simultaneous strong tension of the quadriceps muscle. In this case, the kneecap is most often dislocated laterally (outwards), often causing damage to the soft tissues of the knee joint area.