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(English captions by Andrea Matsumoto from the University of Michigan)

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The Trendelenburg test assesses for hip stability.

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The examiner sits behind the patient and places
thumbs in the posterior superior iliac spines

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and hands on the iliac crests to check for
level height.

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The patient then stands on one leg with the
raised unsupported leg flexed at the knee

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and hip.

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In normal function, the unsupported pelvis
elevates slightly, indicating the gluteus

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medius muscle appropriately abducts the supported
hip.

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If the pelvis drops on the unsupported side
or remains level, it's considered a positive

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Trendelenburg, indicating a weak gluteus medius
or intra-articular pathology in the supported hip.