Drops
When gluteus medius and minimus are injured, a patient will show a positive Trendelenburg sign. This means that when this patient attempts to stand on the left leg only, the uninjured right hip will drop. This is because gluteus medius and minimus on the stable left leg support the pelvis so that it will remain level when the right leg is lifted--when these muscles are injured on the supported left side, the right side of the pelvis will drop.
Make sure you understand what Trendelenburg sign is, what it means, and why the pelvis drops on the uninjured side!