Superior gluteal -the superior gluteal nerve supplies gluteus minimus and medius-two muscles that are important abductors of the hip-and tensor fasciae latae. these muscles stabilize the pelvis when walking. they work in such a way that when you are standing on your right leg only, the muscles on the right side are holding the left side of the pelvis level. when you are standing on your left leg only, the muscles of the left side are supporting the right side of the pelvis. so, if a patient exhibits this characteristic hip drop on the uninjured side while standing on the injured side, this is called trendelenburg sign. it demonstrates that the superior gluteal nerve was injured and the gluteus minimus and medius can no longer support the hip.
