Oral Posters: Thoraco-lumbar Degenerative

Presented by: C. Kleck - View Audio/Video Presentation (Members Only)


C. Kleck(1), M. Jesse(1), D. Illing(1), A. Williams(1), B. Petersen(1), K. Milligan(1), D. Glueck(1), K. Lind(1), V. Patel(1)

(1) University of Colorado Anschutz Medical Campus, Aurora, CO, United States


Purpose: Normal sacro-iliac joints vary widely in shape, yet it is unclear whether sacro-iliac joint morphology plays a role in the development of sacro-iliac joint pain. 3D CT surface rendering was used to image healthy study participants, the resulting images were used to develop a classification system for sacroiliac joint morphology. In a case-control study comparing healthy research participants to patients with SI pain, we assessed whether the classification of SI joint morphology was associated with pain. Methods and materials: We conducted a retrospective case control study. 3D CT surface rendered images of the SI joint were obtained in 223 normal controls and 34 patients with SI pain syndrome. We measured the sacral and iliac surface areas, and performed morphologic 3D assessment of both articular surfaces. We classified the SI joints into three types based on morphology (Types 1, 2 and 3). We used descriptive statistics to provide a reference standard for normal SI joints. We used multivariate models to assess whether articular surface area differed between study participants with and without SI pain. We also assessed the association between morphology type and the presence of pain.

Results: Sacral and iliac surface areas differ by participant sex. Sacral and iliac surface area was associated with SI joint pain in both males (p=0.0007) and in females (p=0.02). In females (p=0.04), but not in males (p=0.11), joint shape was associated with pain.

Conclusion: Our study provides insight into the association between shape and joint surface area and sacro-iliac pain. Further, prospective studies will allow us to determine the role of joint shape and surface area in the patho-etiology of sacroiliac pain, and thus provide information for patients and physicians about prevention or treatment.