Abstract
Computer-navigated and minimally invasive TKAs are emerging technologies that have distinct strengths and weaknesses. We compared duration of surgery, length of hospitalization, Knee Society scores, radiographic alignments, and complications in two unselected groups of 81 consecutive knees that underwent TKA using either a minimally invasive approach or computer navigation. The two groups were operated on by two different surgeons over differing timeframes. The mean surgical time was longer in the navigated group by 63 minutes. The Knee Society scores and lengths of hospitalization of the two groups were similar. The postoperative component alignments of the two groups were similar; the mean femoral valgus and tibial varus angles of the navigation group changed from 96° and 88° preoperatively to 95° and 89° postoperatively, respectively, and in the minimally invasive group, the mean femoral valgus angles and tibial varus angles changed from 97° and 88° preoperatively to 95° and 89° postoperatively, respectively. There were 11 major and three minor complications in the navigation group, including one revision, two femoral shaft fractures, four reoperations for knee stiffness, and four instances of bleeding from tracker sites. We believe the higher incidence of complications in addition to the longer operative time in the navigated group may outweigh any potential radiographic benefits.
Level of Evidence: Level II, therapeutic study. See the Guidelines for Authors for a complete description of levels of evidence.
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Acknowledgments
We thank Lindsay Rudert, Margo McMahon, Gina Zerrusen, and Colleen Kazmarek for collecting data and assisting with the preparation of the manuscript.
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One or more of the authors (PMB, DAD, MAM) are consultants for and receive funding from Stryker.
Each author certifies that his or her 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 for participation in the study was obtained.
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Bonutti, P.M., Dethmers, D., Ulrich, S.D. et al. Computer Navigation-assisted versus Minimally Invasive TKA. Clin Orthop Relat Res 466, 2756–2762 (2008). https://doi.org/10.1007/s11999-008-0429-7
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DOI: https://doi.org/10.1007/s11999-008-0429-7