The Hip Socket
The acetabulum and the strongest straps
In Lesson 7 you met the ball. Now meet the socket: the acetabulum, a deep cup in your pelvis that hugs the femur so tightly your leg can swing, spin, and strut.
The acetabulum, cut open
Real anatomy photo spot: the acetabulum with its labrum ring cradling the femoral head
A cup with a rim
The acetabulum isn't a smooth bowl — it has a rim of cartilage called the labrum that grips the femoral head like a rubber seal. The labrum deepens the socket so the ball can't slip out, even when you swing your leg hard.
The strongest straps in the body
The hip is wrapped in the strongest ligaments in your body. The iliofemoral ligament at the front can withstand more force than any other ligament — it stops your leg from bending backwards when you stand and walk. It's shaped like an upside-down V, like a strong guy-rope holding a tent pole.
Mr. Bones says: I'm a fictional skeleton, not a doctor! This is for learning and fun. If anything hurts, stop and tell a grown-up you trust.
