Factors associated with ambulatory status 6 months after total hip arthroplasty.
OBJECTIVE
To identify an assessment tool and its cut-off point for indicating ambulatory status 6 months after total hip arthroplasty (THA).


METHODS
Cross-sectional study.


METHODS
Kyoto University Hospital.


METHODS
Eighty-eight patients who underwent unilateral THA.


METHODS
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.


CONCLUSIONS
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.
Rehabilitation Unit, Kyoto University Hospital, Sakyo-ku, Kyoto, Japan. Electronic address: nankaku@kuhp.kyoto-u.ac.jp.
M
M
Nankaku
Department of Orthopaedic Surgery, Faculty of Medicine, Kyoto University, Sakyo-ku, Kyoto, Japan.
H
H
Akiyama
Rehabilitation Unit, Kyoto University Hospital, Sakyo-ku, Kyoto, Japan.
R
R
Kakinoki
Rehabilitation Unit, Kyoto University Hospital, Sakyo-ku, Kyoto, Japan.
T
T
Nishikawa
Rehabilitation Unit, Kyoto University Hospital, Sakyo-ku, Kyoto, Japan.
Y
Y
Tanaka
Department of Orthopaedic Surgery, Faculty of Medicine, Kyoto University, Sakyo-ku, Kyoto, Japan.
S
S
Matsuda
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000534:rehabilitation*; D002183:Canes; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D053580:Muscle Strength / Q000502:physiology; D018482:Muscle, Skeletal / Q000502:physiology; D010147:Pain Measurement; D016059:Range of Motion, Articular / Q000502:physiology; D016138:Walking / Q000502:physiology*
Gait ability; Lower limb load; Total hip arthroplasty