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KMID : 1211620230180020093
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Journal of the Korean Society of Physical Medicine
2023 Volume.18 No. 2 p.93 ~ p.101
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Study of the Reliability and Validity of the WOMAC Index in Patients with Total Knee Replacement
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Jo Hoon
Song Hui-Tae
Im Sang-Cheol
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Abstract
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PURPOSE: The Western Ontario and McMaster Universities Arthritis (WOMAC) index has been used to measure the outcome of total knee replacement (TKR), but studies on its reliability and validity are limited. The present study examined the reliability and validity of this index for patients with knee osteoarthritis who underwent TKR.
METHODS: Seventy-one inpatients and outpatients who underwent bilateral TKR for knee osteoarthritis were included in this study. The pain assessment scale and WOMAC index were used to evaluate the participants every two weeks to examine the test?retest reliability, internal consistency, and construct validity.
RESULTS: The test?retest reliability scores for pain, stiffness, and physical function were .75?.92, .85?.90, and .75 ?.95, respectively. The corresponding intraclass correlation coefficients were .75?.88, .76?.88, and .71?.95, respectively. The internal consistency score in the first and second examinations was .92. Furthermore, the construct validity scores for pain, stiffness, and physical function were .83, .41, and .58, respectively.
CONCLUSION: The application of the WOMAC index in patients who underwent TKR showed high test?retest reliability and internal consistency with the use of the WOMAC index and good validity with the use of the pain assessment scale.
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KEYWORD
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Construct validity, Osteoarthritis, Reliability, TKR, WOMAC index
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