{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,19]],"date-time":"2025-10-19T15:39:49Z","timestamp":1760888389836,"version":"build-2065373602"},"reference-count":24,"publisher":"Wiley","issue":"6","license":[{"start":{"date-parts":[[2009,10,17]],"date-time":"2009-10-17T00:00:00Z","timestamp":1255737600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Knee surg. sports traumatol. arthrosc."],"published-print":{"date-parts":[[2010,6]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>This study evaluated the accuracy of an image\u2010free navigated total knee arthroplasty (TKA) system when used to align deformed tibia bone models. The accuracy was assessed in normal, 10\u00b0 varus, 20\u00b0 varus, 10\u00b0 valgus, and 20\u00b0 valgus tibia bone models (a total of five tibial models) by direct measurement of the navigated cutting guide. The mean angular errors in the tibial mechanical axes of the normal, 10\u00b0, and 20\u00b0 varus models, respectively, were 0.0\u00b0, 0.7\u00b0 varus, and 2.4\u00b0 varus. Thus, the errors seen with the two varus models were significantly larger than that associated with the normal model. The mean angular errors were 0.1\u00b0 varus and 0.4\u00b0 valgus in the 10\u00b0 and 20\u00b0 valgus models, respectively. These errors were not significantly different from those obtained with the normal model. These results suggest that in varus\u2010deformed knees, image\u2010free navigation has a tendency to cut the tibia in varus. This fact is considered to be one of the reasons for the lack of superiority of TKA alignment in severely deformed knees when using image\u2010free navigation. Therefore, special attention must be paid when using image\u2010free navigation TKA in such cases.<\/jats:p>","DOI":"10.1007\/s00167-009-0944-4","type":"journal-article","created":{"date-parts":[[2009,10,16]],"date-time":"2009-10-16T08:39:37Z","timestamp":1255682377000},"page":"763-768","source":"Crossref","is-referenced-by-count":13,"title":["Accuracy of image\u2010free navigation for severely deformed knees"],"prefix":"10.1002","volume":"18","author":[{"given":"Minoru","family":"Takasaki","sequence":"first","affiliation":[{"name":"Department of Orthopaedic Surgery Graduate School of Medical Sciences Kyushu University 3\u20101\u20101\u00a0Maidashi 812\u20108582 Higashi\u2010ku, Fukuoka Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shuichi","family":"Matsuda","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery Graduate School of Medical Sciences Kyushu University 3\u20101\u20101\u00a0Maidashi 812\u20108582 Higashi\u2010ku, Fukuoka 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