The purpose of this study was to evaluate the effect of changing activity after total knee arthroplasty (TKA) on metabolic syndrome with a follow-up period of 2 years. Two hundred consecutive patients who were to undergo TKA were prospectively enrolled. The patients' blood pressure, fasting plasma glucose level, the lipid profile, the waist circumference, the Knee Society score, and the Lower Extremity Activity Scale were measured preoperatively and at the 2-year follow-up visit. The data from 169 patients were finally collected and reviewed. Two years after primary TKA, there was no change in the prevalence of metabolic syndrome, despite that the patients had a significant increase of their physical activity.
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