If L5, S1, and S2 were entirely non-functional would muscles in the gluteal region still be able to laterally rotate the thigh at the hip? Explain your answer.
Yes, they would. Most of the muscles in the gluteal region that laterally rotate the thigh at the hip are innervated by fibers from spinal levels L4, L5, S1, and/or S2 (GMax, piriformis, gemellus inferior, gemellus superior, quadratus femoris and obturator internus). But the posterior fibers of GMedius and GMinimus are also able to laterally rotate the thigh at the hip and are innervated by L4, L5, and S1. As long as L4 was functional, lateral rotation will most likely still occur, though the overall contraction force will be significantly lower.