A common source of groin pain can be adductor tendinopathy. There are five hip adductor muscles: pectineus, adductor brevis and adductor longus (called short adductors) go from the pelvis to the thigh bone and the gracilis and adductor magnus (long adductors) go from the pelvis to the knee. The main function of these adductor muscles is to pull the legs together. They are also used quite a lot in sprinting, playing football, horse riding and hurdling.