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Computer-assisted cup placement techniques in total hip arthroplasty improve accuracy of placement

Jolles, Brigitte
Published in Clinical Orthopaedics and Related Research. 2004, no. 426, p. 174-9
Abstract Malposition of the acetabular component during hip arthroplasty increases the occurrence of impingement, reduces range of motion, and increases the risk of dislocation and long-term wear. To prevent malpositioned hip implants, an increasing number of computer-assisted orthopaedic systems have been described, but their accuracy is not well established. The purpose of this study was to determine the reproducibility and accuracy of conventional versus computer-assisted techniques for positioning the acetabular component in total hip arthroplasty. Using a lateral approach, 150 cups were placed by 10 surgeons in 10 identical plastic pelvis models (freehand, with a mechanical guide, using computer assistance). Conditions for cup implantations were made to mimic the operating room situation. Preoperative planning was done from a computed tomography scan. The accuracy of cup abduction and anteversion was assessed with an electromagnetic system. Freehand placement revealed a mean accuracy of cup anteversion and abduction of 10 degrees and 3.5 degrees, respectively (maximum error, 35 degrees). With the cup positioner, these angles measured 8 degrees and 4 degrees (maximum error, 29.8 degrees), respectively, and using computer assistance, 1.5 degrees and 2.5 degrees degrees (maximum error, 8 degrees), respectively. Computer-assisted cup placement was an accurate and reproducible technique for total hip arthroplasty. It was more accurate than traditional methods of cup positioning.
Keywords Arthroplasty, Replacement, Knee/methodsElectromagnetic PhenomenaHumansModels, AnatomicReproducibility of ResultsSurgery, Computer-Assisted
PMID: 15346070
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Research group Chirurgie orthopédique et traumatologique (98)
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JOLLES, Brigitte, GENOUD, Patrick, HOFFMEYER, Pierre. Computer-assisted cup placement techniques in total hip arthroplasty improve accuracy of placement. In: Clinical Orthopaedics and Related Research, 2004, n° 426, p. 174-9. https://archive-ouverte.unige.ch/unige:41786

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Deposited on : 2014-11-13

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