The top of the femur has three important structures. The acetabulum is surrounded by a ridge that stops the ball of the femur head from slipping out of place. This is a concave dent in the pelvis constructed from the ischium, ilium, and pubis bones. Where the rounded head of the femur fits into the pelvis is called the acetabulum. As the hips support the weight of the upper body and bear shocks that run upward from the lower body, this is an extremely stable joint. These muscles not only allow movement but stabilize the hip. ![]() Circumduction: swinging one leg in a circular motionĪll of these movements are possible thanks to the ball and socket structure of the hip joint and a large number of contributing muscles.Internal rotation: rotating the leg inward, as with knock-knees.External rotation: rotating the leg outward, such as when sitting on a horse.Adduction: bringing the leg back to the midline from an abducted position.Abduction: bringing the leg out to the side, such as when doing the splits.Extension: bringing the leg back, as when walking (the trailing leg).Flexion: bringing the leg forward, such as when walking and climbing stairs.From the hip we can carry out the following types of movement: As a multiaxial joint, the acetabulofemoral joint has a broad range of motion abduction is just one of these. ![]() It is the meeting point of two bones – the pelvis and the head of the femur. ![]() The hip joint is a paired ball and socket joint that connects the pelvis to the legs.
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