Safe zone quantification of the third sacral segment in normal and dysmorphic sacra

John S. Hwang, Mark C. Reilly, Mohammad K. Shaath, Stuart Changoor, Jonathan Garland Eastman, Milton Lee Routt, Michael S. Sirkin, Mark R. Adams

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Objective: To quantify the osseous anatomy of the dysmorphic third sacral segment and assess its ability to accommodate internal fixation. Design: Retrospective chart review of a trauma database. Setting: University Level 1 Trauma Center. Patients: Fifty-nine patients over the age of 18 with computed tomography scans of the pelvis separated into 2 groups: A group with normal pelvic anatomy and a group with sacral dysmorphism. Main Outcome Measurements: The sacral osseous area was measured on computed tomography scans in the axial, coronal, and sagittal planes in normal and dysmorphic pelves. These measurements were used to determine the possibility of accommodating a transiliac transsacral screw in the third sacral segment. Results: In the normal group, the S3 coronal transverse width averaged 7.71 mm and the S3 axial transverse width averaged 7.12 mm. The mean S3 cross-sectional area of the normal group was 55.8 mm. The dysmorphic group was found to have a mean S3 coronal transverse width of 9.49 mm, an average S3 axial transverse width of 9.14 mm, and an S3 cross-sectional area of 77.9 mm. Conclusions: The third sacral segment of dysmorphic sacra has a larger osseous pathway available to safely accommodate a transiliac transsacral screw when compared with normal sacra. The S3 segment of dysmorphic sacra can serve as an additional site for screw placement when treating unstable posterior pelvic ring fractures.

Original languageEnglish (US)
Pages (from-to)178-182
Number of pages5
JournalJournal of Orthopaedic Trauma
Volume32
Issue number4
DOIs
StatePublished - Apr 1 2018

Keywords

  • dysmorphic sacra
  • iliosacral screw
  • pelvis
  • sacral fracture

ASJC Scopus subject areas

  • Surgery
  • Orthopedics and Sports Medicine

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    Hwang, J. S., Reilly, M. C., Shaath, M. K., Changoor, S., Eastman, J. G., Routt, M. L., Sirkin, M. S., & Adams, M. R. (2018). Safe zone quantification of the third sacral segment in normal and dysmorphic sacra. Journal of Orthopaedic Trauma, 32(4), 178-182. https://doi.org/10.1097/BOT.0000000000001100