The hip joint is a ball and socket joint which allows it to move forward and backward, sideways, and rotate in and out. It is a very stable joint covered by many muscles all around.
Bone
The head of the femur, shaped like a ball fits tightly into the socket formed by acetabulum of pelvic bone.
Cartilage
The joint is covered by horse-shoe shaped acetabular cartilage and round femur cartilage.
Ligaments
The Round ligament & ligament of Bigelow add to the stability of the joint.
Muscle Tendons
Strong gluteal and thigh muscles cover the hip joint all around.