Hip Rotation Positions

Supine testing is usually the most restricted position but may provide more constraints than sitting. Prone hip rotation testing generally allows more motion because the hip is extended and ligaments are described as more relaxed. Tall sitting can anteriorly orient the pelvis, and anterior pelvic tilt is associated with reduced internal rotation in hip impingement research. Supine testing creates pelvic asymmetry because one hip is flexed while the other remains extended. Prone testing may bias the pelvis anteriorly and make the femur appear to have more internal rotation. Seated hip rotation testing is difficult to standardize because posture strongly changes pelvic orientation.