"The shape of the human pelvis reflects the unique demands placed on the hip abductor muscles (gluteus medius and gluteus minimus), which stabilize the body in the frontal plane during bipedal locomotion. This morphological shift occurred early in hominin evolution, yet important shape differences between hominin species have led to significant disagreement about abductor function and locomotor capability in these extinct taxa." -Warrener
Anat Rec (Hoboken). 2017 May;300(5):932-945. doi: 10.1002/ar.23558.
Hominin Hip Biomechanics: Changing Perspectives.