Preference-based quality of life of end-stage ankle arthritis treated with arthroplasty or arthrodesis.

BACKGROUND: Health state values, or "utilities,'' are an important preference-based measure of quality of life used by health economists. This study describes the utilities reported by a multicenter cohort of subjects with end-stage ankle arthritis treated with ankle arthrodesis or total ankle arthroplasty. MATERIALS AND METHODS: Subjects with end-stage ankle arthritis were enrolled in a multicenter prospective cohort study. All subjects received either ankle arthrodesis or total ankle arthroplasty. Participants completed baseline SF-36 outcome evaluations preoperatively and at 1-year followup. Preference-based quality of life was assessed using health state values (HSVs) derived from the SF-36 (SF-6D transformation). RESULTS: 107 subjects were included. The mean baseline SF-6D health state value for the TAA group was 0.67 (95% CI 0.64 to 0.69) and 0.66 (95% CI 0.63 to 0.68) for the arthrodesis group. At 1-year followup, the mean reported health state value was 0.73 (95% CI 0.71 to 0.76) for the total ankle arthroplasty group and 0.73 (95% CI 0.70 to 0.76) for the ankle arthrodesis group. The 1-year followup results approach age- and gender-matched US population norms. Health state values poorly correlated with age, however, significant differences between genders were detected. CONCLUSION: These data demonstrate an improvement in preference-based quality of life following ankle arthroplasty or arthrodesis. The results also provide necessary data that can be used in future cost-effectiveness analyses.