caa a22 4500 605459800 CHVBK 20210128100235.0 cr unu---uuuuu 210128e20150501xx s 000 0 eng 10.1007/s00167-013-2794-3 doi (NATIONALLICENCE)springer-10.1007/s00167-013-2794-3 High accuracy in knee alignment and implant placement in unicompartmental medial knee replacement when using patient-specific instrumentation [Elektronische Daten] [P. Volpi, E. Prospero, C. Bait, M. Cervellin, A. Quaglia, A. Redaelli, M. Denti] Purpose: The influence of patient-specific instrumentations on the accuracy of unicompartmental medial knee replacement remains unclear. The goal of this study was to examine the ability of patient-specific instrumentation to accurately reproduce postoperatively what the surgeon had planned preoperatively. Methods: Twenty consecutive patients (20 knees) who suffered from isolated unicompartmental medial osteoarthritis of the knee and underwent medial knee replacement using newly introduced magnetic resonance imaging-based patient-specific instrumentation were assessed. This assessment recorded the following parameters: (1) the planned and the postoperative mechanical axis acquired through long-leg AP view radiographies; (2) the planned and the postoperative tibial slope acquired by means of standard AP and lateral view radiographies; and (3) the postoperative fit of the implanted components to the bone in coronal and sagittal planes. The hypothesis of the study was that there was no statistically significant difference between postoperative results and preoperatively planned values. Results: The study showed that (1) the difference between the postoperative mechanical axis (mean 1.9° varus±1.2° SD) and the planned mechanical axis (mean 1.8° varus±1.2° SD) was not statistically significant; (2) the difference between the postoperative tibial slope (mean 5.2°±0.6° SD) and the planned tibial slope (mean 5.4°±0.6° SD) was statistically significant (p=0.008); and (3) the postoperative component fit to bone in the coronal and sagittal planes was accurate in all cases; nevertheless, in one knee, all components were implanted one size smaller than preoperatively planned. Moreover, in two additional cases, one size thinner and one size thicker of the polyethylene insert were used. Conclusions: This study suggests that overall patient-specific instrumentation was highly accurate in reproducing postoperatively what the surgeon had planned preoperatively in terms of mechanical axis, tibial slope and component fit to bone. Level of evidence: IV. Springer-Verlag Berlin Heidelberg, 2013 Knee arthroplasty nationallicence Unicompartmental nationallicence Patient-specific instrumentation nationallicence Alignment nationallicence Accuracy nationallicence Volpi P. Knee Surgery and Sport Traumatology Unit, Humanitas Clinical and Research Center, Via Manzoni 56, 20089, Rozzano, Milan, Italy aut Prospero E. Knee Surgery and Sport Traumatology Unit, Humanitas Clinical and Research Center, Via Manzoni 56, 20089, Rozzano, Milan, Italy aut Bait C. Knee Surgery and Sport Traumatology Unit, Humanitas Clinical and Research Center, Via Manzoni 56, 20089, Rozzano, Milan, Italy aut Cervellin M. Knee Surgery and Sport Traumatology Unit, Humanitas Clinical and Research Center, Via Manzoni 56, 20089, Rozzano, Milan, Italy aut Quaglia A. Knee Surgery and Sport Traumatology Unit, Humanitas Clinical and Research Center, Via Manzoni 56, 20089, Rozzano, Milan, Italy aut Redaelli A. Knee Surgery and Sport Traumatology Unit, Humanitas Clinical and Research Center, Via Manzoni 56, 20089, Rozzano, Milan, Italy aut Denti M. Knee Surgery and Sport Traumatology Unit, Humanitas Clinical and Research Center, Via Manzoni 56, 20089, Rozzano, Milan, Italy aut Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/5(2015-05-01), 1292-1298 0942-2056 23:5<1292 2015 23 167 https://doi.org/10.1007/s00167-013-2794-3 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00167-013-2794-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Volpi P. Knee Surgery and Sport Traumatology Unit, Humanitas Clinical and Research Center, Via Manzoni 56, 20089, Rozzano, Milan, Italy aut NATIONALLICENCE 700 1- Prospero E. Knee Surgery and Sport Traumatology Unit, Humanitas Clinical and Research Center, Via Manzoni 56, 20089, Rozzano, Milan, Italy aut NATIONALLICENCE 700 1- Bait C. Knee Surgery and Sport Traumatology Unit, Humanitas Clinical and Research Center, Via Manzoni 56, 20089, Rozzano, Milan, Italy aut NATIONALLICENCE 700 1- Cervellin M. Knee Surgery and Sport Traumatology Unit, Humanitas Clinical and Research Center, Via Manzoni 56, 20089, Rozzano, Milan, Italy aut NATIONALLICENCE 700 1- Quaglia A. Knee Surgery and Sport Traumatology Unit, Humanitas Clinical and Research Center, Via Manzoni 56, 20089, Rozzano, Milan, Italy aut NATIONALLICENCE 700 1- Redaelli A. Knee Surgery and Sport Traumatology Unit, Humanitas Clinical and Research Center, Via Manzoni 56, 20089, Rozzano, Milan, Italy aut NATIONALLICENCE 700 1- Denti M. Knee Surgery and Sport Traumatology Unit, Humanitas Clinical and Research Center, Via Manzoni 56, 20089, Rozzano, Milan, Italy aut NATIONALLICENCE 773 0- Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/5(2015-05-01), 1292-1298 0942-2056 23:5<1292 2015 23 167