Abstract
Background
While surgical navigation offers the opportunity to accurately place an acetabular component, questions remain as to the best goal for acetabular component positioning in individual patients. Overall functional orientation of the pelvis after surgery is one of the most important variables for the surgeon to consider when determining the proper goal for acetabular component orientation.
Questions/Purposes
We measured the variation in pelvic tilt in 30 patients before THA and the effect of THA on pelvic tilt in the same patients more than a year after THA.
Methods
Each patient had a CT study for CT-based surgical navigation and standing and supine radiographs before and after surgery. Pelvic tilt was calculated for each of the radiographs using a novel and validated two-dimensional/three-dimensional matching technique.
Results
Mean supine pelvic tilt changed less than 2°, from 4.4° ± 6.4° (range, −7.7° to 20.8°) before THA to 6.3° ± 6.6° (range, −5.7° to 19.6°) after THA. Mean standing pelvic tilt changed less than 1°, from 1.5° ± 7.2° (range, −13.1° to 12.8°) before THA to 2.0° ± 8.3° (range, −12.3° to 16.8°) after THA. Preoperative pelvic tilt correlated with postoperative tilt in both the supine (r2 = 0.75) and standing (r2 = 0.87) positions.
Conclusions
In this population, pelvic tilt had a small and predictable change after surgery. However, intersubject variability of pelvic tilt was high, suggesting preoperative pelvic tilt should be considered when determining desired acetabular component positioning on a patient-specific basis.
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Each author certifies that he or she, or a member of his or her immediate family, has no commercial associations (eg, consultancies, stock ownership, equity interest, patent/licensing arrangements, etc) that might pose a conflict of interest in connection with the submitted article.
All ICMJE Conflict of Interest Forms for authors and Clinical Orthopaedics and Related Research editors and board members are on file with the publication and can be viewed on request.
Each author certifies that his institution has approved the human protocol for this investigation, that all investigations were conducted in conformity with ethical principles of research, and that informed consent was obtained.
This work was performed at the Center for Computer Assisted and Reconstructive Surgery, New England Baptist Hospital, Boston, MA, USA.
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Murphy, W.S., Klingenstein, G., Murphy, S.B. et al. Pelvic Tilt Is Minimally Changed by Total Hip Arthroplasty. Clin Orthop Relat Res 471, 417–421 (2013). https://doi.org/10.1007/s11999-012-2581-3
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DOI: https://doi.org/10.1007/s11999-012-2581-3