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Skeletal DetailsHuman femur This modern Homo sapiens bone shows the structure of the femur of an upright walker or bipedal animal. The ball joint, the part that joins the pelvis, sits directly over the outside of the knee. (quadrupedal animals have femurs in which the ball joint, the part that joins the pelvis, sits directly over the inside of the knee.) The angle subtended by the femur at the knee in bipedal walkers is greater than that of quadrupedal walkers. This results in the inner bump of the knee joint being longer than the outer bump.
Other skeletal details
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