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Intraoperative component positioning correlates with native hip orientation in THA patients with OA
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A researcher-recommended safe component orientation matches the native hip anatomy for patients with osteoarthritis who undergo total hip arthroplasty, according to results of this study.
“Acetabular anteversion of the osteoarthritic hip as defined by the native acetabular rim typically matches the recommended component ‘targets’ for cup insertion. There was no specific relationship among native acetabular inclination, acetabular anteversion, and femoral anteversion,” Christian Merle, MD, MSc, and colleagues wrote in the abstract. “Neither native acetabular inclination nor native combined anteversion appears to be related to current implant insertion targets.”
Merle and colleagues retrospectively evaluated CT scans from 131 consecutive patients with end-stage hip osteoarthritis (OA), according to the abstract. The patients were positioned supine and the scans were taken in sets “from the cranial aspect of the acetabulum to below the lesser trochanter, from below the lesser trochanter to a point 50 mm distal to the femoral isthmus, and four to six slices of the knee,” the researchers wrote.
The mean femoral anteversion was 13°, the mean acetabular anteversion was 19° and the mean acetabular inclination was 62°, with no significant differences in femoral, acetabular, combined anteversion or acetabular inclination in either male or female patients, according to the abstract.
The patients’ native hips were also scanned with reference to a “safe zone” of 40° ± 10° inclination and 15° ± 10° anteversion. In 95% of the cases, the acetabulum was within this safe zone, 15% of acetabulum was in the safe zone and 63% of patients who had combined anteversion were in the safe zone.
Disclosure: Merle received grants from ENDO Stiftung, Biomet and Zimmer for work on this study.
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