Gluteus medius is one of 3 muscles in the buttocks and is situated on the outer surface of the hip. The function of the gluteus medius is to assist with pelvis stability, hip abduction, along with internal and external rotation of the hip. Tears of the gluteus medius usually occur where the tendon inserts at the greater trochanter, causing lateral hip pain.
Injuries to the hamstring group of muscles can range from a minor strain to a complete tear. Avulsion injury occurs when the hamstring muscle tendon completely tears away from the bone. Sometimes, a piece of bone may also be pulled away in an avulsion injury.