Despite the long-term survivorship and clinical effectiveness of total knee arthroplasty (TKA), the percentage of patients who indicate dissatisfaction with their procedures (little improvement in pain and function) can be as high as 15% to 30%.1-3 Although early reports on survivorship of unicompartmental knee arthroplasty (UKA) were discouraging, recent studies assessing modern implant designs and surgical techniques have found 10-year survival rates of 90% to 98%.4 The number of UKAs performed over the past decade has increased by 30%, as numerous studies have demonstrated shorter hospital stays, decreased perioperative morbidity, faster functional recovery, increased range of motion (ROM), and improved knee kinematics compared with TKA.4
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