Tibial component overhang of more than 3 mm medially increases risk of short-term postoperative revision in UKA
Although Unicompartmental Knee Arthroplasty (UKA) has many advantages, the literature has shown that UKA has a higher revision rate than total knee arthroplasty (TKA). Common reasons for revision in UKA are knee pain, aseptic loosening of the component, progression of contralateral knee osteoarthritis, and bearing wear/dislocation. Some studies have shown that the position of the tibial component in Oxford unicompartmental knee arthroplasty with a mobile bearing will affect the clinical outcome of patients. Hence, Kanglong Wu et al conducted a study to investigate the relationship between the overhang distance of the tibial component and the survival of the implant.
A retrospective analysis of patients who underwent unicompartmental knee arthroplasty was done. The study was divided into three groups:
minor underhang group (underhang between -3 and 0 mm);
minor overhang group (overhang 0–3 mm); and
major overhang group (overhang >=3 mm).
Demographic and clinical profile characteristics of each group were compared and survival curves of each group were also compared using Kaplan–Meier and modeled using multivariate Cox regression.
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