Prospective Observational Study of Factors Related to the Movement Subscale Score of the Japanese Orthopaedic Association Hip-Disease Evaluation Questionnaire Six Months After Total Hip Arthroplasty

Abstract Background The movement subscale score of the Japanese Orthopaedic Association Hip-Disease Evaluation Questionnaire (JHEQ) is reportedly lower than other subscale scores after total hip arthroplasty (THA). This study aimed to assess factors related to the movement subscale score of the JHEQ six months after THA. Methods Participants were 90 female patients with hip osteoarthritis who underwent THA. We examined clinical background factors and surgical information, and measured hip joint range of motion, lower extremity muscle strength, maximum walking speed, physical activity, Japanese Orthopaedic Association score, and JHEQ score. We also measured the number of steps and “fast walking time” as physical activity, and calculated the moderate intensity activity ratio. A stepwise logistic regression analysis was used to identify factors related to high and low movement subscale scores. Results Six months after surgery, the total score and all subscale scores of the JHEQ were significantly higher compared to preoperative scores (p < 0.01). The movement subscale score was lower compared to other subscale scores (p < 0.01). The stepwise multiple regression analysis revealed that preoperative movement subscale score (odds ratio: 1.26, 95%CI: 1.08–1.47, p = 0.003), activities of daily living category of the Japanese Orthopaedic Association hip score (odds ratio: 1.66, 95%CI: 1.18–2.33, p = 0.004), and moderate intensity activity ratio (odds ratio: 1.05, 95%CI: 1.00-1.11, p = 0.035) are factors that determine high and low movement subscale scores. Conclusion The postoperative movement subscale score is related to not only the ability to conduct activities of daily living and preoperative movement subscale score, but also the moderate intensity activity ratio.