posterior superior iliac spine


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

[TA]
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 ?
The effects of experience on the inter-reliability of osteopaths to detect changes in posterior superior iliac spine levels using a hidden heel wedge.
Terms Used PSIS reliability, posterior superior iliac spine reliability, PSIS agreement, posterior superior iliac spine agreement; PSIS palpation; posterior superior iliac spine palpation.
The posterior superior iliac spine was palpated and a small fascial opening was made just lateral to it.
Schantz pins attached to T-handle chucks placed in both posterior superior iliac spines are used as reduction tools.
Sectioning of the anterior SI ligaments and the sacrospinous ligaments allowed the pelvis to completely open, until the point of bony abutment by the posterior superior iliac spines (PSISs).
Prior to measurements, the skin levels of T1, T12, L5, and posterior superior iliac spines were located by palpation with the subjects standing upright by using the protocol described by Chen et al.
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.
(3) Fitt defined neutral alignment as having the ASIS and the posterior superior iliac spines (PSIS) on the same horizontal plane.4 Using either convention, possible misalignments on the sagittal plane are tilting the top of the pelvis too far forward (anterior tilt) or tilting the top of the pelvis too far backward (posterior tilt).
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.

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