The influence of surgical factors on dislocation of the meniscal bearing after Oxford medial unicompartmental knee replacement

A case-control study

S. Y. Lee, Ji Hoon Bae, Jae Gyoon Kim, Ki-Mo Jang, Won Yong Shon, K. W. Kim, H. C. Lim

Research output: Contribution to journalArticle

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.

Original languageEnglish
Pages (from-to)914-922
Number of pages9
JournalBone and Joint Journal
Volume96 B
Issue number7
DOIs
Publication statusPublished - 2014 Jan 1

Fingerprint

Knee Replacement Arthroplasties
Thigh
Case-Control Studies
Tibia
Extremities
Logistic Models
Odds Ratio
Regression Analysis
Confidence Intervals
Bone and Bones

ASJC Scopus subject areas

  • Surgery
  • Orthopedics and Sports Medicine

Cite this

The influence of surgical factors on dislocation of the meniscal bearing after Oxford medial unicompartmental knee replacement : A case-control study. / Lee, S. Y.; Bae, Ji Hoon; Kim, Jae Gyoon; Jang, Ki-Mo; Shon, Won Yong; Kim, K. W.; Lim, H. C.

In: Bone and Joint Journal, Vol. 96 B, No. 7, 01.01.2014, p. 914-922.

Research output: Contribution to journalArticle

@article{da4f37c3a41d4170afbd9cef27ba4cc7,
title = "The influence of surgical factors on dislocation of the meniscal bearing after Oxford medial unicompartmental knee replacement: A case-control study",
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.",
author = "Lee, {S. Y.} and Bae, {Ji Hoon} and Kim, {Jae Gyoon} and Ki-Mo Jang and Shon, {Won Yong} and Kim, {K. W.} and Lim, {H. C.}",
year = "2014",
month = "1",
day = "1",
doi = "10.1302/0301-620X.96B7",
language = "English",
volume = "96 B",
pages = "914--922",
journal = "Bone and Joint Journal",
issn = "2049-4394",
publisher = "British Editorial Society of Bone and Joint Surgery",
number = "7",

}

TY - JOUR

T1 - The influence of surgical factors on dislocation of the meniscal bearing after Oxford medial unicompartmental knee replacement

T2 - A case-control study

AU - Lee, S. Y.

AU - Bae, Ji Hoon

AU - Kim, Jae Gyoon

AU - Jang, Ki-Mo

AU - Shon, Won Yong

AU - Kim, K. W.

AU - Lim, H. C.

PY - 2014/1/1

Y1 - 2014/1/1

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84903948895&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84903948895&partnerID=8YFLogxK

U2 - 10.1302/0301-620X.96B7

DO - 10.1302/0301-620X.96B7

M3 - Article

VL - 96 B

SP - 914

EP - 922

JO - Bone and Joint Journal

JF - Bone and Joint Journal

SN - 2049-4394

IS - 7

ER -