Hip Joint: The hip joint is a ball and socket joint. The femoral head (ball) sits in the acetabulum (socket). The gap between the femoral head and the acetabulum is articular cartilage which protects the bones from grinding together, allowing easy movement. The two prominences in the upper part of the femur is the greater trochanter and the lesser trochanter which allow the attachment of muscle to bone. The hip joint is covered by a thick layer of ligaments binding the femur and the acetabulum together, covering the area from the intertrochanteric line (the area between the greater and lesser trochanter) up to the femoral neck.
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