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Spina iliaca posterior superior

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spina iliaca posterior superior --> posterior superior iliac spine

The posterior extremity of the iliac crest, the uppermost point of attachment of the sacrotuberous and posterior sacroiliac ligaments; a readily apparent dimple occurs in the skin overlying the posterior superior iliac spine which is clinically useful as an indication of the level of the S-2 vertebra, the level of the inferior limit of the subarachnoid space.

Synonym: spina iliaca posterior superior.