3/27/2023 0 Comments Abduction medical definition![]() ![]() Hip abduction muscles both contract and relax to allow for this movement these are agonist and antagonist muscles respectively. Without muscles, there is no control of hip motion. The entire joint is supported by strong ligaments that help to keep the hip joint stable during movement. The lunate surface refers to a crescent moon-shaped indentation. This covers the head of the femur and the lunate surface of the acetabulum. The acetabulofemoral joint is protected by a layer of smooth articular cartilage. This neck is the weakest part of the femur bone and is the most common area of damage. The femur neck exits the inner surface of the greater trochanter and supports the rounded femur head. The greater trochanter is an attachment point for various hip muscles. To the outside of the hip is the greater trochanter that you can feel through the skin to the side of the thigh. 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. ![]()
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