M Nankaku1, H Akiyama2, R Kakinoki3, T Nishikawa3, Y Tanaka3, S Matsuda2. 1. Rehabilitation Unit, Kyoto University Hospital, Sakyo-ku, Kyoto, Japan. Electronic address: nankaku@kuhp.kyoto-u.ac.jp. 2. Department of Orthopaedic Surgery, Faculty of Medicine, Kyoto University, Sakyo-ku, Kyoto, Japan. 3. Rehabilitation Unit, Kyoto University Hospital, Sakyo-ku, Kyoto, Japan.
Abstract
OBJECTIVE: To identify an assessment tool and its cut-off point for indicating ambulatory status 6 months after total hip arthroplasty (THA). DESIGN: Cross-sectional study. SETTING: Kyoto University Hospital. PARTICIPANTS: Eighty-eight patients who underwent unilateral THA. MAIN OUTCOME MEASURE: Lower-extremity muscle strength, hip range of motion and hip pain were measured 6 months after THA. The patients were divided into two groups according to their ability to walk 6 months after THA: an independent ambulation group and a cane-assisted ambulation group. RESULTS: A stepwise multiple logistic regression analysis indicated that age and lower-extremity maximal load were significant variables affecting mid-term ambulatory status following THA. Receiver operating characteristic curve analyses revealed that ambulatory status following THA was indicated more accurately by leg extension strength (cut-off point=8.24N/kg, sensitivity=92%, specificity=82%, area under the curve=0.93) than age. CONCLUSION: Lower-limb load force with a cut-off point of 8.24N/kg is a reliable assessment tool for indicating ambulatory status 6 months after primary THA.
OBJECTIVE: To identify an assessment tool and its cut-off point for indicating ambulatory status 6 months after total hip arthroplasty (THA). DESIGN: Cross-sectional study. SETTING: Kyoto University Hospital. PARTICIPANTS: Eighty-eight patients who underwent unilateral THA. MAIN OUTCOME MEASURE: Lower-extremity muscle strength, hip range of motion and hip pain were measured 6 months after THA. The patients were divided into two groups according to their ability to walk 6 months after THA: an independent ambulation group and a cane-assisted ambulation group. RESULTS: A stepwise multiple logistic regression analysis indicated that age and lower-extremity maximal load were significant variables affecting mid-term ambulatory status following THA. Receiver operating characteristic curve analyses revealed that ambulatory status following THA was indicated more accurately by leg extension strength (cut-off point=8.24N/kg, sensitivity=92%, specificity=82%, area under the curve=0.93) than age. CONCLUSION: Lower-limb load force with a cut-off point of 8.24N/kg is a reliable assessment tool for indicating ambulatory status 6 months after primary THA.
Authors: Siri B Winther; Olav A Foss; Otto S Husby; Tina S Wik; Jomar Klaksvik; Vigdis S Husby Journal: Acta Orthop Date: 2018-03-01 Impact factor: 3.717