{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,8]],"date-time":"2026-01-08T01:19:18Z","timestamp":1767835158237,"version":"3.49.0"},"reference-count":32,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2013,8,29]],"date-time":"2013-08-29T00:00:00Z","timestamp":1377734400000},"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":[[2014,3]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Purpose<\/jats:title><jats:p>To compare the femoral and tibial components rotational alignment in total knee arthroplasty (TKA) performed either with conventional or with patient\u2010specific instrumentation.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Forty\u2010five patients underwent primary TKA and were prospectively randomized into two groups: 22 patients into the conventional instrumentation group (group A) and 23 patients into the Signature\u2122 patient\u2010specific instrumentation group (group B). All patients underwent computed tomography of the operated knee in the first week after surgery to measure the components rotation.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The femoral component rotation was 0.0\u00b0 (\u22120.25, 1.0) in group A, and 0.0\u00b0 (0.0, 1.0) in group B. The tibial component rotation was \u221216.0\u00b0 (\u221218.5, 11.8) in group A, and \u221216.0\u00b0 (\u221219.0, \u221214.0) in group B. There were no significant differences between the two groups in tibial and femoral components rotation. The difference between the tibial component rotation and the neutral tibial rotation was similar in both groups [2.0\u00b0 (\u22120.5, 6.3) in group A and 2.0\u00b0 (\u22121.0, 4.0) in group B], but the dispersion around the median was different between the two groups. The amplitude of the difference between tibial rotation and neutral position was 27\u00b0 (\u221213, 14) in group A and 9\u00b0 (\u22123, 6) in group B.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>There is a smaller chance of internal malrotation of the tibial component with the Signature\u2122 patient\u2010specific instrumentation system, with less dispersion and amplitude of the tibial component rotation around the neutral position.<\/jats:p><\/jats:sec><jats:sec><jats:title>Level of evidence<\/jats:title><jats:p>II.<\/jats:p><\/jats:sec>","DOI":"10.1007\/s00167-013-2639-0","type":"journal-article","created":{"date-parts":[[2013,8,28]],"date-time":"2013-08-28T06:40:50Z","timestamp":1377672050000},"page":"636-642","source":"Crossref","is-referenced-by-count":34,"title":["Patient\u2010specific instrumentation improves tibial component rotation in TKA"],"prefix":"10.1002","volume":"22","author":[{"given":"Alcindo","family":"Silva","sequence":"first","affiliation":[{"name":"Orthopedics Departament Hospital Militar D. Pedro V Avenida da Boavista 4050\u2010113 Porto Portugal"}]},{"given":"Ricardo","family":"Sampaio","sequence":"additional","affiliation":[{"name":"Hospital da Boavista 171, Avenida da Boavista 4050\u2010113 Porto Portugal"}]},{"given":"Elisabete","family":"Pinto","sequence":"additional","affiliation":[{"name":"Department of Hygiene and Epidemiology Medical School of University of Porto Alameda Prof. Hernani Monteiro 4200\u2010319 Porto 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