title: Preoperative predictors of ambulation ability at different time points after total hip arthroplasty in patients with osteoarthritis.
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.
authors.affiliation: Course of Physical Therapy, School of Health Sciences, Faculty of Medicine, Kagoshima University, 8-35-1 Sakuragaoka, Kagoshima 890-8544, Japan ; Kagoshima Physical Therapy Association, Kagoshima 897-0132, Japan ; Red Cross Kagoshima Hospital, Kagoshima 891-0133, Japan.
authors.forename: Akiko
authors.initials: A
authors.lastname: Kamimura
authors.affiliation: Course of Physical Therapy, School of Health Sciences, Faculty of Medicine, Kagoshima University, 8-35-1 Sakuragaoka, Kagoshima 890-8544, Japan.
authors.forename: Harutoshi
authors.identifier: 0000-0002-6805-2742
authors.initials: H
authors.lastname: Sakakima
authors.affiliation: Department of Physical Therapy, Kyushu Nutrition Welfare University, Fukuoka 800-0298, Japan.
authors.forename: Fumio
authors.initials: F
authors.lastname: Tsutsumi
authors.affiliation: Red Cross Kagoshima Hospital, Kagoshima 891-0133, Japan.
authors.forename: Nobuhiko
authors.initials: N
authors.lastname: Sunahara