Comprehensive Osteopathic Medical Licensing Examination (COMLEX USA) Practice

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Prepare for the COMLEX-USA with quizzes featuring flashcards and multiple-choice questions, each with hints and explanations. Gear up for your osteopathic medicine exam!

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What muscle is tested during the Trendelenburg test?

Gluteus medius
Psoas
Quadriceps
Tibialis anterior

The correct answer is: Gluteus medius

The Trendelenburg test is specifically designed to assess the function of the gluteus medius muscle. This muscle plays a critical role in stabilizing the pelvis during single-leg stance. When a person stands on one leg, the gluteus medius on the side of the standing leg should contract to keep the pelvis level. If there is weakness or dysfunction in the gluteus medius, there will be a noticeable drop of the pelvis on the opposite side, indicating positive Trendelenburg sign. The other muscles listed, such as the psoas, quadriceps, and tibialis anterior, are not primarily involved in this specific stability function during the Trendelenburg test. The psoas is more associated with hip flexion, the quadriceps with knee extension and support, and the tibialis anterior with dorsiflexion of the foot. Therefore, assessing the gluteus medius directly correlates with the mechanics that the Trendelenburg test is meant to evaluate.