• Kiran Singisetti, Karthikeyan Muthumayandi, Zaid Abual-Rub, and David Weir.
• University Hospital of North Durham, Durham, DH1 5TW, UK. kiransingisetti@gmail.com.
• Arch Orthop Trauma Surg. 2015 Nov 1; 135 (11): 1595-601.

IntroductionNavigation technique for total knee replacement has been shown to improve accuracy of prosthesis alignment in several studies. The purpose was to compare the patient-reported outcome measures in primary total knee replacement (TKR) using navigation versus conventional surgical technique at 1- and 2-year follow-up.Materials And MethodsA retrospective review of prospectively collected patient-reported outcome data for 351 consecutively performed primary TKR was included in the study. The study group (N = 113) included patients who had Triathlon TKR using articular surface mounted (ASM Stryker) navigation technique and control group (N = 238) included patients who had Triathlon TKR using conventional jig. In addition to the WOMAC (Western Ontario and McMaster University Osteoarthritis Index) and SF-36 (Medical Outcomes Trust Short Form-36), a short self-report questionnaire evaluating the level of satisfaction, quality of life and whether patients would undergo knee replacement again.ResultsWOMAC: no significant difference between the groups was noted in mean WOMAC pain, function and stiffness scores at 1- and 2-year follow-up. SF-36: no significant difference between the groups was seen except in the physical function component of score at 1 year (p = 0.019). Navigation group mean 56.78 (CI 51.06-62.5) versus conventional group mean 48.34 (44.68-52.01) but this difference was not observed at 2-year follow-up.ConclusionsThe overall patient-reported outcome scores improved after total knee replacement but appear to be comparable in both groups at 1- and 2-year follow-up.

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