A sign of gluteus medius weakness or relative inhibition. The sign is elicited by asking the patient to stand on the involved leg. If the sign is positive, the pelvis will drop on the uninvolved side.
The film clip depicts the same patient as described before, here he exhibits weak hip abductors. When standing on one leg with the aid of a walking frame the patient is stable because the upper body is supported by the arms. However, when asked to repeat the movement without holding the frame, the patients' pelvis drops on the unsupported side - a positive Trendelenburg sign. He tries to correct this by inclining his upper body over his supporting leg but he is unstable in this position and falls.
In poliomyelitis the virus may attack peripheral nerves such as the superior gluteal nerve which supplies gluteus medius and minimus, leading to a Trendelenburg gait.
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