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American Journal of Roentgenology, Vol 150, Issue 4, 857-859
Copyright © 1988 by American Roentgen Ray Society

Articles

The accessory sacroiliac joint: a common anatomic variant

S Ehara, GY el-Khoury, and RA Bergman

Department of Radiology, University of Iowa Hospitals and Clinics, Iowa City 52242.

We identified the accessory sacroiliac joint on 13 (13%) of 100 CT scans of the pelvis and in nine (16%) of 56 dried skeletons. The joint is situated between the medial aspect of the posterior superior iliac spine and a rudimentary transverse tuberosity just lateral to the second sacral foramen. Some joints are true diarthrodial joints and are present at birth, but more commonly they are acquired fibrocartilaginous joints that result from the stress of weight-bearing. Our experience suggests that the accessory sacroiliac joint is not rare and that it is visible on CT scans in many patients.
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Copyright © 1988 by the American Roentgen Ray Society.