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SPINA ILIACA POSTERIOR SUPERIOR
The posterior extremity of the iliac crest, the uppermost point of attachment of the sacrotuberous and posterior sacroiliac ligaments; a readily apparentdimple occurs in the skin overlying the posterior superior iliacspine which is clinically useful as an indication of the level of the S-2 vertebra, the level of the inferiorlimit of the subarachnoid space.
Synonym: spina iliaca posterior superior.