The anatomy of the hip
It is formed by two spherical bone heads, one concave (the acetabulum), the other convex (the femoral head), which perform movements in all planes. The femoral head is then free to rotate within the acetabulum.
The two surfaces of the femoral head and the acetabulum are perfectly congruent and are covered with cartilage, a structure that protects the bone and facilitates sliding between the two joint heads. However, the femoral head is not completely contained within the acetabular cavity.
The entire femoral head is also enveloped by the joint capsule, a structure that fits over the edge of the acetabulum and delimits the joint space.
Around the joint capsule there are also numerous ligaments that provide stability, while certain muscles allow movement of the joint.
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