Abstract
The aims of this study were to identify the preoperative factors influencing ambulation ability at different postoperative time points after total hip arthroplasty (THA) and to examine the cutoff values of predictive preoperative factors by receiver operating characteristic (ROC) curves. Forty-eight women with unilateral THA were measured for hip extensor, hip abductor, and knee extensor muscle strength in both legs; hip pain (visual analog scale, VAS); and the Timed Up and Go (TUG) test pre- and postoperatively. Multiple regression analysis indicated that preoperative knee extensor strength (β = −0.379, R 2 = 0.409) at 3 weeks, hip abductor strength (β = −0.572, R 2 = 0.570) at 4 months, and age (β = 0.758, R 2 = 0.561) at 7 months were strongly associated with postoperative ambulation, measured using the TUG test. Optimal preoperative cutoff values for ambulation ability were 0.56 Nm/kg for knee extensor strength, 0.24 Nm/kg for hip abductor strength, and 73 years of age. Our results suggest that preoperative factors predicting ambulation ability vary by postoperative time point. Preoperative knee extensor strength, hip abductor strength, and age were useful predictors of ambulation ability at the early, middle, and late time points, respectively, after THA.
Highlights
Total hip arthroplasty (THA) is commonly performed in patients with hip osteoarthritis (OA)
We investigated the recovery of lower extremity muscle strength, pain, and the Timed Up and Go (TUG) test results as indicators of ambulation ability at 3 weeks, 4 months, and 7 months after THA
We identified that preoperative knee extensor strength, but not hip muscle strength, was strongly associated with ambulation ability, as measured by the TUG test, at 3 weeks postoperatively
Summary
Total hip arthroplasty (THA) is commonly performed in patients with hip osteoarthritis (OA). THA is effective in decreasing pain, increasing range of motion of the hip joint, increasing muscle strength and stability, and enabling patients with hip OA to return to their normal daily activities. Not all patients obtain the same amount of benefits from THA, and preoperative functional status appears to be an important predictor of the postoperative outcome [4,5,6,7]. As postoperative ambulation ability is an important factor for living an active life and independently performing daily activities, many patients wish to improve their postoperative ambulation ability. Several studies suggest that poor preoperative functional status is associated with poorer outcome after THA [4, 8]. Preoperative factors associated with functional outcome include age, gender, physical function, level of pain, comorbid conditions, Medical Outcomes Study 36-Item Short Form Health Survey (SF-36) score, Rehabilitation Research and Practice
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
