The "ball" portion of the hip joint, located at the proximal end of the femur.
The top of the thigh bone or femur is called the femoral head. It is a rounded ball of bone that is covered by smooth gliding cartilage called articular cartilage. It fits in to the socket of the hip joint called the acetabulum. The femoral head is connected to the thigh bone by a section of bone called the femoral neck.
rounded ball at the end of the upper femur or thighbone; articulates or moves within the acetabulum or cup of the pelvis.