Your Guide to Hip Replacement Surgery . What Is a Hip Replacement? The hip is one of the largest joints in the body and is shaped as a ball and socke ...

The hip flexors connect the top of the femur, which is the largest bone in the body, to the lower back, hips, and groin. There are various hip flexor muscles that all work to enable a person to move.

Lucy's pelvic, hip, and leg bones offered more proof. As in a human, Lucy's thighbones (femurs) angle in from the hip toward the knee. Her shinbones (tibiae) then descend straight to the ground ...