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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.
Full Answer. The femur is the largest and strongest bone in the human body and makes up a quarter of the body's height. The femur is attached to the hip via a ball and socket joint, providing movement and a source to articulate the pelvis. The ball joint is attached by a narrow neck laterally to the vertical femur shaft.