Final answer:
It is false that a left-sided Trendelenburg Sign indicates right gluteus medius weakness; actually, it suggests weakness in the left gluteus medius.
Step-by-step explanation:
The statement is FALSE. If someone demonstrates the Trendelenburg Sign on the left side (left hip drop) during gait, it indicates a weakness in the left gluteus medius, not the right. The Trendelenburg Sign occurs due to the inability of the hip abductor muscles on the standing leg side to maintain the pelvis level when the opposite leg is lifted during walking. Since the right leg is lifted and the left hip drops, it is indicative of the left gluteus medius being weak.