Trendelenburg's sign indicates weakness of which muscle group?

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Multiple Choice

Trendelenburg's sign indicates weakness of which muscle group?

Explanation:
Trendelenburg sign reflects weakness of the hip abductors of the stance leg, primarily the gluteus medius (and minimus). When standing on one leg, these muscles contract to keep the pelvis level in the frontal plane. If they are weak, the pelvis drops on the side opposite the stance leg, creating a positive Trendelenburg sign. The other muscles listed are involved in hip flexion, knee extension, or hip extension, not the pelvic stabilization required during single-leg stance, so weakness there wouldn’t produce this sign.

Trendelenburg sign reflects weakness of the hip abductors of the stance leg, primarily the gluteus medius (and minimus). When standing on one leg, these muscles contract to keep the pelvis level in the frontal plane. If they are weak, the pelvis drops on the side opposite the stance leg, creating a positive Trendelenburg sign. The other muscles listed are involved in hip flexion, knee extension, or hip extension, not the pelvic stabilization required during single-leg stance, so weakness there wouldn’t produce this sign.

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