Abstract
PURPOSE: Studies on physical activity (PA) after revision total hip arthroplasty (THA) are limited. It is important to assess PA levels as well as improvements in physical function and pain after revision THA. The purpose of the study was to compare accelerometer-measured PA and health-related quality of life (HR-QoL) in patients 1-3 years after revision or primary THA. We also clarified the relationship between measured PA and HR-QoL. METHODS: This cross-sectional study included 64 patients who underwent revision THA and 188 who underwent primary THA 1-3 years earlier. Outcome measures were accelerometer-measured light PA, moderate-to-vigorous intensity PA, number of steps, questionnaire-based Oxford hip score, SF-8 physical and mental component scores. We conducted propensity-score matching for age, sex, comorbidities, body mass index, and postoperative follow-up duration and compared PA levels and HR-QoL scores between patients after revision THA and primary THA of each 50 patients. RESULTS: Based on propensity scores in the revision THA (68.3 years) and primary THA (67.8 years) groups, light PA, number of steps, and HR-QoL scores 1-3 years after revision THA were significantly lower than those after primary THA (P < 0.05). Moderate-to-vigorous intensity PA did not different between groups (P = 0.204). Measured light PA, moderate-to-vigorous intensity PA, and number of steps after re-THA were moderately correlated with HR-QoL scores. CONCLUSION: Increasing the time and frequency spent on light PA to the levels after primary THA may lead to an increase in overall PA levels after revision THA. A detailed understanding of PA, including light PA, in daily life and an approach that promotes activity levels are necessary.