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Related Experiment Videos

The accessory sacroiliac joint: a common anatomic variant.

S Ehara1, G Y el-Khoury, R A Bergman

  • 1Department of Radiology, University of Iowa Hospitals and Clinics, Iowa City 52242.

AJR. American Journal of Roentgenology
|April 1, 1988
PubMed
Summary

The accessory sacroiliac joint, located near the posterior superior iliac spine, is frequently observed in pelvic CT scans and anatomical specimens. This anatomical variation can manifest as a congenital or acquired joint, often related to weight-bearing stress.

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Area of Science:

  • Anatomy
  • Radiology
  • Orthopedics

Background:

  • The sacroiliac joint is crucial for pelvic stability.
  • Accessory sacroiliac joints are anatomical variations with limited research.
  • Understanding these variations is important for interpreting pelvic imaging.

Purpose of the Study:

  • To determine the prevalence of accessory sacroiliac joints.
  • To describe the anatomical location and characteristics of these joints.
  • To assess the detectability of accessory sacroiliac joints on computed tomography (CT) scans.

Main Methods:

  • Retrospective analysis of 100 pelvic CT scans.
  • Examination of 56 dried pelvic skeletons.
  • Detailed anatomical description and location recording.

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Main Results:

  • Accessory sacroiliac joints were identified in 13% of CT scans and 16% of skeletons.
  • The joint is located between the posterior superior iliac spine and a transverse tuberosity near the second sacral foramen.
  • Joints were characterized as congenital diarthrodial or acquired fibrocartilaginous types.

Conclusions:

  • Accessory sacroiliac joints are not rare anatomical variations.
  • CT imaging is effective in visualizing these joints in patients.
  • Recognition of accessory sacroiliac joints is important for accurate radiological assessment.