title: Prevalence and predictors of post-operative coronal alignment outliers and their association with the functional outcomes in navigated total knee arthroplasty.
abstract: We aimed to determine the prevalence and predictors for being an outlier after navigated TKA and asked whether navigated TKAs with perfect coronal alignment have better functional outcomes than those without it. Alignment was measured in 124 patients (191 knees) with navigated TKAs who were available for 1year functional outcome assessment. The outcomes were compared among the 3 subgroups divided by the deviation of mechanical axis from neutral (0°): the perfect, 0° or within 1°; the acceptable, 1°-3°; and the outlier, beyond 3°. The prevalence of outliers was 20.4%, and the severity of preoperative varus deformity was the strongest predictor. Accuracy of coronal alignment in radiographs did not correlate consistently with functional outcomes.
authors.affiliation: Jawaharlal Nehru Medical College, Aligarh Muslim University, Aligarh, India.
authors.forename: Madhav
authors.initials: M
authors.lastname: Chowdhry
authors.affiliation: Joint Reconstruction Center, Seoul National University Bundang Hospital, Bundang-gu, Seongnam-si, Korea.
authors.forename: Ankur B
authors.initials: AB
authors.lastname: Bamne
authors.affiliation: Joint Reconstruction Center, Seoul National University Bundang Hospital, Bundang-gu, Seongnam-si, Korea.
authors.forename: Young Gon
authors.initials: YG
authors.lastname: Na
authors.affiliation: Joint Reconstruction Center, Seoul National University Bundang Hospital, Bundang-gu, Seongnam-si, Korea.
authors.forename: Yeon Gwi
authors.initials: YG
authors.lastname: Kang
authors.affiliation: Joint Reconstruction Center, Seoul National University Bundang Hospital, Bundang-gu, Seongnam-si, Korea. Electronic address: osktk@snubh.org.
authors.forename: Tae Kyun
authors.initials: TK
authors.lastname: Kim
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000379:methods*; D017760:Bone Malalignment / Q000000981:diagnostic imaging* / Q000209:etiology / Q000517:prevention & control; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000000981:diagnostic imaging / Q000601:surgery*; D015995:Prevalence; D011859:Radiography; D012399:Rotation; D025321:Surgery, Computer-Assisted / Q000009:adverse effects; D016896:Treatment Outcome
keywords: alignment; computer-assisted navigation; functional outcomes; outliers; total knee arthroplasty