Does spinal alignment influence acetabular orientation: a study of spinopelvic variables and sagittal acetabular version.
Publication/Presentation Date
2-1-2014
Abstract
OBJECTIVE: Although hip alignment and spinal alignment have been studied individually, there is little information concerning the relationship between them. The questions addressed in this study are: (i) Is there a reproducible measure of sagittal plane acetabular orientation; (ii) Is sagittal plane acetabular orientation determined more by pelvic incidence (PI) or acetabular wall coverage?
METHODS: Data on patients who had undergone screening by CT scan of the pelvis for non-orthopedic indications from 2005-2010 were retrospectively studied. There were 164 patients of mean age 59 years (range, 27-87). Patients with pelvic trauma, hip arthroplasty or other hip pathology were excluded. Measurements of relevant acetabular and spinopelvic variables were made in the sagittal plane. The sacro-acetabular angle (SA) was defined as the angle between a tangent line to the anterior and posterior walls of the acetabulum and the S1 endplate. Multiple regression analysis was used to determine which factors contribute to SA angle.
RESULTS: The mean sacro-acetabular angle was 72° (SD = 14.8°). Center edge angles (CEAs) were measured at the anterior and posterior walls of the acetabulum. Mean anterior CEA was 69° (SD = 8.3°) and posterior CEA 107° (SD = 16.4°). Regression analysis revealed the largest significant predictors of SA angle were PI and A-CEA.
CONCLUSIONS: Sagittal acetabular orientation is related to spino-pelvic balance and morphological characteristics. Increased PI or posterior wall coverage corresponds to a more vertical acetabular orientation. Sagittal plane acetabular alignment may be an important variable in achieving favorable results after reconstruction.
Volume
6
Issue
1
First Page
15
Last Page
22
ISSN
1757-7861
Published In/Presented At
Radcliff, K. E., Kepler, C. K., Hellman, M., Restrepo, C., Jung, K. A., Vaccaro, A. R., Albert, T. J., & Parvizi, J. (2014). Does spinal alignment influence acetabular orientation: a study of spinopelvic variables and sagittal acetabular version. Orthopaedic surgery, 6(1), 15–22. https://doi.org/10.1111/os.12090
Disciplines
Business Administration, Management, and Operations | Health and Medical Administration | Management Sciences and Quantitative Methods
PubMedID
24590988
Department(s)
Administration and Leadership
Document Type
Article