A correlation study of the walking performance and the Chinese SF-36 in persons with total knee arthroplasty

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A correlation study of the walking performance and the Chinese SF-36 in persons with total knee arthroplasty


Author: So, Kuen-wai Jimmy
Title: A correlation study of the walking performance and the Chinese SF-36 in persons with total knee arthroplasty
Degree: M.Sc.
Year: 2000
Subject: Knee -- Diseases -- Patients -- Rehabilitation
Walking -- Physiological aspects
Walking -- Health aspects
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Dept. of Rehabilitation Sciences
Pages: xiii, 144 leaves : ill. ; 31 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1517827
URI: http://theses.lib.polyu.edu.hk/handle/200/4179
Abstract: The health status measure such as health-related quality of life measure can assess more global dimensions of health than the traditional impairment-related measures. To date, physiotherapists still conduct a paucity of research on the use of the health-related quality of life measure of patients with TKA. A health related measure worth exploring on patients with TKA is the Medical Outcome Study (MOS) Short Form 36-Item Health Survey (SF-36). The SF-36, consisting of 8 scales, is a validated and reliable generic health status indicator used in various disease groups and general population internationally. The SF-36 has been translated into Chinese (Hong Kong) standard version 1.0 (Chinese SF-36 in short) recently. The Chinese SF-36 was chosen in this study because it is short to administer, acceptable to the target patients group. This study was divided into two parts in implementation. The objective of the first part of the study was to provide evidence on the content validity, test-retest reliability, and internal consistency of the Chinese SF-36 in assessing patients with TKA. The second part of this study was the main objective of this study. The aim was to explore the relationship between the scorings of the 8 scales of the Chinese SF-36 and the walking performance, one of the functional outcome measurements of patients with TKA. All subjects in this study were recruited from Margaret Trench Rehabilitation Centre (MTMRC). The patient subjects of MTMRC came from all over Hong Kong. An expert panel of six experienced health professional staff was invited to review the content validity. The percentages of agreement on the relevance and representativeness of the Chinese SF-36 in measuring the health status of Chinese population with TKA were found to be satisfactorily over 83% of agreement on each item. The estimations of the content validity were computed through average content validity indexes (CVI) and were found to be above 90% for both relevance and representativeness of the Chinese SF-36 in measuring health status of patients with TKA. The Chinese SF-36 was then administered to a group of 25 in-patients and expatients with TKA in a 2-day interval to establish the test-retest reliability of the Chinese SF-36. By computing the intra-class correlation (ICC) and Spearman' s rho correlation coefficients for all the 8 scales of the Chinese SF-36 the findings ranged from 0.86 to 0.95 and 0.73 to 0.89 (p=0.000) respectively. In the study of the internal consistency of the SF-36, forty-four inpatients and expatients with TKA (including those in the test-retest study) were successfully recruited by convenience sampling. The internal consistency of the each of the 8 scales of the Chinese SF-36 measured by Cronbach's a and the Guttman split-half reliability coefficients ranged from 0.70 to 0.90 and from 0.55 to 0.90 respectively. The corrected item-total correlation coefficients of each scale were all above 0.40 except 2 items in the physical functioning scale. The same 44 in-patients and ex-patients with TKA were also used to study the relationship between their walking performance and the scoring of Chinese SF-36. The walking performance test included sub-tests of the comfortable walking speed, maximal walking speed and stairs walking time. The Spearman' s rho correlation coefficient between the sub-tests of the walking performance and the scale scores of the physical functioning, role-physical, bodily pain and social functioning in the 44 subjects ranged from 0.538 to 0.691(p=0.000). In conclusion, the Chinese SF-36 is a valid and reliable health status measure for the Chinese patient samples with TKA. Four out of eight scales of the Chinese SF-36 are moderately correlated with the walking performance of patients with TKA. Physiotherapists are recommended to use the Chinese SF-36 to measure the health status of their patients with TKA. Since the subject number is limited, generalization of the result to population with TKA will be limited. Further studies on validation of the Chinese SF-36 are recommended.

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