scholarly journals Fixed-bearing medial unicompartmental knee arthroplasty restores neither the medial pivoting behavior nor the ligament forces of the intact knee in passive flexion

2018 ◽  
Vol 36 (7) ◽  
pp. 1868-1875 ◽  
Author(s):  
Mohammad Kia ◽  
Lucian C. Warth ◽  
Joseph D. Lipman ◽  
Timothy M. Wright ◽  
Geoffrey H. Westrich ◽  
...  
Keyword(s):  
Knee Arthroplasty ◽  
Unicompartmental Knee Arthroplasty ◽  
Fixed Bearing ◽  
Unicompartmental Knee ◽  
Medial Unicompartmental Knee Arthroplasty ◽  
Passive Flexion ◽  
Intact Knee

scholarly journals Medial Unicompartmental Knee Arthroplasty with a Fixed Bearing Implant

2019 ◽  
Vol 9 (3) ◽  
pp. e26
Author(s):  
Philip Winnock de Grave ◽  
Thomas Luyckx ◽  
Alexander Ryckaert ◽  
Jan Noyez ◽  
Paul Gunst ◽  
...  
Keyword(s):  
Knee Arthroplasty ◽  
Unicompartmental Knee Arthroplasty ◽  
Fixed Bearing ◽  
Unicompartmental Knee ◽  
Medial Unicompartmental Knee Arthroplasty

scholarly journals Mobile Versus Fixed Bearing Medial Unicompartmental Knee Arthroplasty: A Series of 375 Patients

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Robert Murphy ◽  
Tyler Fraser ◽  
William Mihalko
Keyword(s):  
Range Of Motion ◽  
Knee Arthroplasty ◽  
Unicompartmental Knee Arthroplasty ◽  
Mobile Bearing ◽  
Lateral Compartment ◽  
Fixed Bearing ◽  
Unicompartmental Knee ◽  
Significant Difference ◽  
Medial Unicompartmental Knee Arthroplasty ◽  
Component Loosening

Introduction: We sought to compare outcomes, complications and survival between mobile and fixed bearing medial unicompartmental knee arthroplasty (UKA) in a large multi-surgeon group.Methods: Medical records of patients who underwent a medial UKA were queried between March 2003 and August 2012. Variables investigated included final range of motion (ROM), type of complication, and overall survivorship. Results: 375 medial UKAs were analyzed (308 mobile bearing and 67 fixed bearing). Average time to follow-up was 47 months. Final ROM was comparable (mobile: 1-122°, fixed: 1-120°, p = 0.34). Complications occurred in 20/308 (6.6%) mobile bearing UKA and 5/67 (7.5%) fixed bearing UKA (p = 0.77). The most common complications in mobile bearing implants were progression of lateral compartment disease and component loosening. The complications in fixed bearing implants were arthrofibrosis and tibial plateau fracture. Overall survivorship differed, but not significantly (mobile: 94.8%, fixed: 96.9%, p = 0.44). Discussion: In this largest reported cohort series comparing mobile versus fixed bearing UKA, we found no significant difference in final clinical knee range of motion, rates of complications, and survivorship between the two bearing types. 

Risk of revision for medial unicompartmental knee arthroplasty according to fixation and bearing type

2021 ◽  
Vol 103-B (7) ◽  
pp. 1261-1269
Author(s):  
Joost A. Burger ◽  
Hendrik A. Zuiderbaan ◽  
Inger N. Sierevelt ◽  
Liza van Steenbergen ◽  
Peter A. Nolte ◽  
...  
Keyword(s):  
Knee Arthroplasty ◽  
Unicompartmental Knee Arthroplasty ◽  
Hospital Volume ◽  
Cox Regression ◽  
Mobile Bearing ◽  
Periprosthetic Fractures ◽  
Fixed Bearing ◽  
Adjusted Risk ◽  
Unicompartmental Knee ◽  
Medial Unicompartmental Knee Arthroplasty

Aims Uncemented mobile bearing designs in medial unicompartmental knee arthroplasty (UKA) have seen an increase over the last decade. However, there are a lack of large-scale studies comparing survivorship of these specific designs to commonly used cemented mobile and fixed bearing designs. The aim of this study was to evaluate the survivorship of these designs. Methods A total of 21,610 medial UKAs from 2007 to 2018 were selected from the Dutch Arthroplasty Register. Multivariate Cox regression analyses were used to compare uncemented mobile bearings with cemented mobile and fixed bearings. Adjustments were made for patient and surgical factors, with their interactions being considered. Reasons and type of revision in the first two years after surgery were assessed. Results In hospitals performing less than 100 cases per year, cemented mobile bearings reported comparable adjusted risks of revision as uncemented mobile bearings. However, in hospitals performing more than 100 cases per year, the adjusted risk of revision was higher for cemented mobile bearings compared to uncemented mobile bearings (hazard ratio 1.78 (95% confidence interval 1.34 to 2.35)). The adjusted risk of revision between cemented fixed bearing and uncemented mobile bearing was comparable, independent of annual hospital volume. In addition, 12.3% of uncemented mobile bearing, 20.3% of cemented mobile bearing, and 41.5% of uncemented fixed bearing revisions were for tibial component loosening. The figures for instability were 23.6%, 14.5% and 11.7%, respectively, and for periprosthetic fractures were 10.0%, 2.8%, and 3.5%. Bearing exchange was the type of revision in 40% of uncemented mobile bearing, 24.3% of cemented mobile bearing, and 5.3% cemented fixed bearing revisions. Conclusion The findings of this study demonstrated improved survival with use of uncemented compared to cemented mobile bearings in medial UKA, only in those hospitals performing more than 100 cases per year. Cemented fixed bearings reported comparable survival results as uncemented mobile bearings, regardless of the annual hospital volume. The high rates of instability, periprosthetic fractures, and bearing exchange in uncemented mobile bearings emphasize the need for further research. Cite this article: Bone Joint J 2021;103-B(7):1261–1269.

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