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Unicompartmental Knee Arthroplasty Essay

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Introduction: Unicompartmental knee arthroplasty (UKA) is gaining popularity due to its less invasiveness and quicker recovery than total knee arthroplasty (TKA). However, incidence of tibia-related complications such as tibial component subsidence and fracture has been increased. These may be due to improper surgical technique selection such as excessive removal of tibia plateau, including excessive posterior slope, exposing soft metaphyseal bone prone to fracture and implant subsidence. Mobile-bearing UKA allows minimal tibial bone resection because thinner polyethylene bearing can be used since there are less concerns about polyethylene wear.

Objectives: We proposed UKA surgical technique for fix-bearing UKA to resect minimal amount of tibial, mainly to leave hard subchondral bone under tibial component in order to prevent tibial component subsidence and fracture.

Methods: Retrospective study comparing …show more content…

The subchondral-sparring group were operated during 2010-2013 and consisted of 179 patients. Other than different mean follow-up period, there was no significant difference regarding patient demographics. There were 5 tibia-related complications (3 gross component subsidence and loosening and 2 tibial plateau fracture). All these complications were detected within 6 months after index surgery. One patient with subsidence and 2 patients with fracture required revision to TKA. There were no tibia-related complication in subchondral-sparring group. The incidence of tibia-related complication between the two groups are statistically significant. (Fisher exact test, 5/166 VS 0/179; p=0.025). There was no femur-related complication. Two patients in measure-resection group require revision to TKA due to progression of disease in lateral compartment at 5 and 7 years post-op. Clinical outcomes at 2-year when excluding cases with complications were similar in both

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