Risk factors of postoperative valgus malalignment in mobile-bearing medial unicompartmental knee arthroplasty

2018 ◽  
Vol 139 (2) ◽  
pp. 241-248 ◽  
Author(s):  
Qidong Zhang ◽  
Qian Zhang ◽  
Wanshou Guo ◽  
Man Gao ◽  
Ran Ding ◽  
...  
Keyword(s):  
Risk Factors ◽  
Knee Arthroplasty ◽  
Unicompartmental Knee Arthroplasty ◽  
Mobile Bearing ◽  
Unicompartmental Knee ◽  
Medial Unicompartmental Knee Arthroplasty ◽  
Valgus Malalignment

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. 

scholarly journals New Instrumentation Reduces Operative Time in Medial Unicompartmental Knee Arthroplasty Using the Oxford Mobile Bearing Design

2015 ◽  
Vol 5 (4) ◽  
Author(s):  
Keith Berend ◽  
Jason Hurst ◽  
Michael Morris ◽  
Joanne Adams ◽  
Adolph Lombardi
Keyword(s):  
Knee Arthroplasty ◽  
Unicompartmental Knee Arthroplasty ◽  
Operative Time ◽  
Mobile Bearing ◽  
Phase Iii ◽  
Unicompartmental Knee ◽  
Medial Unicompartmental Knee Arthroplasty ◽  
New Instrumentation ◽  
Time Savings ◽  
Bearing Design

Redesigned instrumentation has become available for implantation of the Oxford Mobile Bearing Medial unicompartmental knee arthroplasty. To assess the benefit of these changes, we compared operative time of 200 Phase III and 176 Microplasty UKA done 2008-2011. An average time savings of 8.6 minutes was seen with the Microplasty design.  Additionally, the standard deviation in operative times, minimum and maximum operatives were lower in knees in which Microplasty instrumentation was utilized.  A 15% savings in operative time was seen with the new Microplasty instrumentation. 

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