The hip joint is composed of the head of the femur bone fitting into the acetabulum of the pelvis. The main bones are the femur, which has a head, neck, greater trochanter, lesser trochanter, and gluteal tuberosity, and the pelvis, which forms the acetabulum. The hip joint is stabilized by the iliofemoral, pubofemoral, and ischiofemoral ligaments and muscles like the gluteals, quadriceps, and iliopsoas.