Total hip arthroplasty (THA) is an effective procedure that provides patients with long-term relief from pain and enables them to restore their normal daily activities. Preoperative instruction about the functional outcomes and optimum goal of rehabilitation is very helpful for patients undergoing THA.
The purpose of this study was to examine the relationships between preoperative physical functions and ambulation following THA and to identify optimal cut-off values for estimating the ambulatory status at 6 months after THA.
This was a retrospective study.
The study subjects were 204 patients who underwent unilateral THA. The hip abductor and knee extensor strengths were measured and the timed up and go (TUG) test was conducted preoperatively. The patients were then divided into two groups according to self-reported walking ability at 6 months postoperatively: independent ambulation group (n=118) and cane-assisted ambulation group (n=86). The differences between two groups were examined by an unpaired t-test or the chi-square test. A stepwise multiple logistic regression analysis was performed with the walking ability at 6 months postoperatively as a dependent variable and age, gender, contralateral hip OA (+/–), BMI, hip abductor strength, knee extensor strength, and TUG test as independent variables. Then, Receiver operating characteristic curves analysis was used to identify a cut off point for classifying the patients into the two groups.
A stepwise multiple logistic regression analysis selected three factors (age, knee extensor strength and TUG test) as significant variables affecting the mid-term ambulatory ability after THA. Moreover, receiver operating characteristic curve analyses revealed that the mid-term ambulatory status after THA was more accurately predicted by the TUG test (cut-off point: 10 3 seconds; sensitivity: 76.7%; specificity: 93.2%; area under the curve: 0.93) than by age and knee extensor strength.
The categorization in this study is based solely on self-reported walking ability.
Our findings indicated that patients with a preoperative TUG test of < 10 seconds are likely to walk without an assistive device at 6 months after THA.
Source: http://ptjournal.apta.org/cgi/content/short/ptj.20120016v1?rss=1
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