Luxation of the patella from the trochlea of the femur is usually a result of one or more anatomical abnormalities of the pelvic limb, such as coxa vara, a shallow trochlear groove, abnormalities of the m. quadriceps and m. rectus femoris and malformation of the femur and / or the tibia. The severity of patellar luxation is graded on a scale of 0 to 4, based on orthopaedic examination of the knee. The treatment is medically or surgically. There are several surgical techniques; usually a combination is used.
From AVOM viewpoint a misalignment of the tibia (exo-or endo rotation) in relation to the femur is one of the causes of knee problems like patellar luxation. AVOM corrects the abnormal position and thus treats the condition with good curative and preventive outcome.