posterior superior iliac spine

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pos·te·ri·or su·pe·ri·or il·i·ac 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 that is clinically useful as an indication of the level of the S2 vertebra, the level of the inferior limit of the subarachnoid space.

pos·te·ri·or su·pe·ri·or il·i·ac spine

(PSIS) (pos-tēr'ē-ŏr sŭ-pēr'ē-ŏr il'ē-ak spīn) [TA]
The landmark at the posterior aspect of the ilium; palpated just lateral to the sacroiliac joint.
References in periodicals archive ?
Interexaminer reliability and accuracy of posterior superior iliac spine and iliac crest palpation for spinal level estimations.
Comparing the anatomical consistency of the posterior superior iliac spine to the iliac crest as reference landmarks for the lumbopelvic spine: a retrospective radiological study.
The effects of experience on the inter-reliability of osteopaths to detect changes in posterior superior iliac spine levels using a hidden heel wedge.
The inclinometer was placed vertically on the sacrum so that the center of the inclinometer was aligned at the level of the posterior superior iliac spines.
First, the skin levels of T1, T12, L5, and posterior superior iliac spines were palpated and marked when the subjects were standing, and the marks moved upwards during spinal flexion.
McLain and coworkers (8) placed reflective markers on dancers' anterior superior and posterior superior iliac spines and videotaped them in front of a large grid.
Three-dimensional reflective markers were placed by palpation on the dancers leotards at the anterior and posterior superior iliac spines (Fig.
Finally, the experimenter used palpation to place reflective markers on the dancers' anterior and posterior superior iliac spines.

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