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A. B. A= Upright as seen looking from the right side. The rectus femoris muscle runs from kneecap to two tendons at the top, one of which attaches straight ahead to the pelvis (the straight head tendon). The other, the backward traveling branch at the top of the rectus femoris attaches to the side of the pelvis all along the edge of the acetabulum (like an eyebrow to the eye socket). You don't need an x-ray to know where the socket edge is. This “reflected head” tendon of the rectus femoris outlines it. Easy to see. But, it is not seen when VRO surgery is done. None of the hip parts – head, neck, acetabulum are visualized in VRO surgery, allowing wrong perceptions about the socket to persist throughout the surgery – especially when distinguishing CDH/DDH from PDH . B= Also note on the right side of image, looking up the femur from the knee,