Conventional Versus Computer-Assisted Technique for Total Knee Arthroplasty: A Minimum of 5-Year Follow-up of 200 Patients in a Prospective Randomized Comparative Trial

Abstract In the literature, studies of computer-assisted total knee arthroplasty (TKA) after mid-term period are not conclusive and long-term data are rare. In a prospective, randomized, comparative study 100 conventional TKAs (group REG) were compared with 100 computer-assisted TKAs (group NAV). Minimum follow-up was 5 years. No difference in implant failure was found with 1.1% in group NAV versus 4.6% in group REG ( P = 0.368). Group NAV showed a significantly less mean deviation of mechanical limb axis ( P = 0.015), more TKAs (90% versus 81% in group REG) were within 3° varus/valgus and a higher tibial slope and lateral distal femoral angle (LDFA) accuracy was found ( P ≤ 0.034). Clinical investigational parameters showed no differences ( P ≥ 0.058). Insall and HSS score total were also higher in group NAV ( P ≤ 0.016).