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The femur is the upper leg bone or thigh. It is the largest bone in the body. At the top of the femur is a rounded protrusion which articulates with the pelvis. This portion is referred to as the head of the femur, or femoral head.
The hip joint is a ball and socket joint located where the thigh bone (femur) meets the pelvic bone. The upper segment (head) of the femur is a round ball that fits inside the cavity in the pelvic bone that forms the socket, also known as the acetabulum.The ends of the bone are covered with a smooth, cushioning layer called articular cartilage.he articular cartilage is what allows the bones to glide smoothly. While the cartilage covers the entire head of the femur, the acetabulum cartilage is in the shape of a horseshoe with a depression (fossa) in the center of the socket.