Isocentric 3-Dimensional C-Arm Imaging of Component Alignments in Total Knee Arthroplasty With Potential Intraoperative and Postoperative Applications |
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| Authors: | Shahram Amiri David R. Wilson Carolyn Anglin Andrew Van Houwelingen Bassam A. Masri |
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| Affiliation: | ? Department of Orthopaedics, University of British Columbia, Vancouver, British Columbia, Canada;† Biomedical Engineering, University of Calgary, Calgary, Alberta, Canada;‡ Department of Civil Engineering, University of Calgary, Calgary, Alberta, Canada;§ McCaig Institute for Bone and Joint Health, University of Calgary, Calgary, Alberta, Canada |
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| Abstract: | An intraoperative imaging tool for total knee arthroplasty could help avoid poor clinical outcomes related to malalignment. We investigated the feasibility of using isocentric (ISO-C) fluoroscopic imaging for this purpose. Three-dimensional ISO-C and computed tomographic (CT) images were acquired from 6 cadaveric specimens implanted with standard knee arthroplasty components and analyzed to determine rotational alignments. In comparison with standard CT measures, the ISO-C–based measures had overall accuracies (determined as root mean square error) of 0.8° and 1.3° and corresponding SDs of 1.3° and 1.4° for the femoral and tibial components, respectively. With ISO-C imaging, it is possible to measure rotational alignment in knee arthroplasty with accuracy and repeatability comparable with CT. Isocentric imaging has strong potential as an intraoperative tool to accurately align arthroplasty components. |
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| Keywords: | knee arthroplasty ISO-C isocentric intraoperative rotational alignment knee replacement |
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