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The influence of surgical factors on dislocation of the meniscal bearing after Oxford medial unicompartmental knee replacement: A case-control study

Authors
Lee S.Y.Bae J.H.Kim J.G.Jang K.M.Shon W.Y.Kim K.W.Lim H.C.
Issue Date
2014
Publisher
British Editorial Society of Bone and Joint Surgery
Citation
Bone and Joint Journal, v.96 B, no.7, pp 914 - 922
Pages
9
Indexed
SCI
SCIE
SCOPUS
Journal Title
Bone and Joint Journal
Volume
96 B
Number
7
Start Page
914
End Page
922
URI
https://scholarworks.korea.ac.kr/kumedicine/handle/2020.sw.kumedicine/30379
ISSN
2049-4394
2049-4408
Abstract
The aim of this study was to evaluate the risk factors for dislocation of the bearing after a mobile-bearing Oxford medial unicompartmental knee replacement (UKR) and to test the hypothesis that surgical factors, as measured from post-operative radiographs, are associated with its dislocation From a total of 480 UKRs performed between 2001 and 2012, in 391 patients with a mean age of 66.5 years (45 to 82) (316 female, 75 male), we identified 17 UKRs where bearing dislocation occurred. The post-operative radiological measurements of the 17 UKRs and 51 matched controls were analysed using conditional logistic regression analysis. The postoperative radiological measurements included post-operative change in limb alignment, the position of the femoral and tibial components, the resection depth of the proximal tibia, and the femoral component-posterior condyle classification. We concluded that a post-operative decrease in the posterior tibial slope relative to the pre-operative value was the only significant determinant of dislocation of the bearing after medial Oxford UKR (odds ratio 1.881; 95% confidence interval 1.272 to 2.779). A postoperative posterior tibial slope < 8.45° and a difference between the pre-operative and postoperative posterior tibial slope of > 2.19° may increase the risk of dislocation. © 2014 The British Editorial Society of Bone & Joint Surgery.
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Bae, Ji Hoon
Guro Hospital (Department of Orthopedic Surgery, Guro Hospital)
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