The Effect of BMI on Survivorship of Unicompartmental Knee Arthroplasty

Survivorship of unicompartmental knee arthroplasty (UKA) is dependent on surgical technique, implant design, and patient selection. The patient selection criteria included unicompartmental disease only, pain confined to the affected compartment, osteo or post-traumatic arthritis, middle age or older, <10° of varus deformity, ROM >90° without a flexion contracture, relatively sedentary occupation, and medial instability only. Patient body mass index (BMI) has also been considered a factor affecting the outcome of UKA. Using a community based total joint registry, the association of BMI and survivorship of UKA was evaluated.