Validation of the Western Ontario and McMaster University Osteoarthritis Index in Asians with Osteoarthritis in Singapore

Thumboo, Julian; Chew, Ling-Huo; Soh, Chang-Heok

doi:10.1053/joca.2000.0410

Cited by 92 publications

(75 citation statements)

References 11 publications

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“…To determine whether this finding was an artefact of our data set, we also examined the factorial structure of WOMAC pain and function items. Consistent with the findings of previous factor analyses, [7][8][9] our results failed to support a factorial structure of the WOMAC that discriminates pain from physical function items. This study suggests that a non-activity-focused pain scale coupled with an activity-focused physical function scale can achieve factorial validity.…”

Section: Discussionsupporting

confidence: 82%

“…4 In retrospect, the strong and partially spurious association between WOMAC pain and physical function scores is not surprising, given the consistency with which factor analyses of this measure have uniformly failed to identify factors consistent with the themes of pain and function. [7][8][9] The results of these studies have shown that factor themes are more consistent with activities (e.g., a factor would contain the items pain with walking and difficulty with walking) than with the independent themes of pain and function. Given the results of these factor analyses, we aimed to determine whether a non-activity-centred pain scale, namely the P4, 10 coupled with the WOMAC physical function items could achieve factorial validity.…”

mentioning

confidence: 99%

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Validating Self-Report Measures of Pain and Function in Patients Undergoing Hip or Knee Arthroplasty

Stratford

Dogra²,

Woodhouse³

et al. 2009

Physiotherapy Canada

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Purpose: To investigate the factorial and construct validity of a four-item pain intensity scale, the P4, in patients awaiting primary total hip or knee arthroplasty secondary to osteoarthritis. Method: A construct validation design was applied to a sample of convenience of 117 patients (mean age 65.6 [SD ¼ 11.2] years) at their preoperative visit. All patients completed the P4 and the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC). Exploratory and confirmatory factor analyses were used to examine the factorial structure of the P4 and WOMAC. To evaluate construct validity, we examined the correlation between the P4 and WOMAC pain sub-scales and the ability of the P4 to differentiate between patients awaiting hip and knee replacement. Results: Two distinct factors consistent with the themes of pain and function were identified with P4 and WOMAC physical function items, but not with the WOMAC pain and physical function items. The P4 correlates more with the WOMAC pain scores (r ¼ 0.67) than with the WOMAC physical function scores (r ¼ 0.60). Conclusion: The P4's validity was supported in this patient group. The use of the P4 with the WOMAC physical function sub-scale provides a more distinct assessment of pain and function than the WOMAC pain and physical function scales.

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Section: Discussionsupporting

confidence: 82%

mentioning

confidence: 99%

Validating Self-Report Measures of Pain and Function in Patients Undergoing Hip or Knee Arthroplasty

Stratford

Dogra²,

Woodhouse³

et al. 2009

Physiotherapy Canada

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“…The Western Ontario and McMaster University Osteoarthritis Index (WOMAC) is a diseasespecific scale most commonly used for assessment of pain, stiffness, and physical function associated with OA. [5][6][7] The Medical Outcomes Study 36-item Short Form Health Survey (SF-36) assesses the pain, physical health, and mental health among patients with chronic diseases with emphasis on assessment of health-related quality of life (HRQOL). 8,9 The Lequesne Algofunctional Index is an outcome measurement instrument for hip and knee diseases assessing the pain, the maximal distance walked, and the activities of daily living.…”

Section: Introductionmentioning

confidence: 99%

A qualitative study on patients with knee osteoarthritis to evaluate the influence of different pain patterns on patients’ quality of life and to find out patients’ interpretation and coping strategies for the disease

Chan¹,

Chan²

2011

Rheumatol Rep

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The objective of this qualitative study of patients with osteoarthritis (OA) of the knee was to evaluate the influence of different pain patterns on their quality of life and to investigate their interpretation and coping strategies for the disease using patient interviews. Patients were recruited by convenience sampling in a private general practice clinic in Hong Kong. Those screened positive for OA of the knee were asked to self-evaluate their average pain score and classify the severity of their OA before attending a semi-structured interview by a research assistant. Twenty patients were interviewed and 98 codes were identified. The content was analyzed independently by two researchers who were not doing the interviews. Codes and themes generated were analyzed based on the grounded theory. A wide range of symptoms was described by patients with OA of the knee, in which pain was the most prominent symptom. Most patients (80%) described two different types of pain, mechanical and inflammatory pain, each presenting with a different pain quality and onset pattern. Most patients self-graded their OA severity at a level higher than their corresponding pain score, indicating that there may be other variables that patients would consider during self-evaluation of severity. More than half of the participants seek medical assistance late because their health-seeking behavior was affected by their perception of the problem, concern, and expectation from treatment. The study findings can help healthcare providers to understand and be aware of the existence of two pain patterns, mechanical and inflammatory pain in knee OA, as well as to appreciate the great variations of symptoms, the different perspectives, and the different coping and health-seeking behaviors among knee OA patients during their management. Finally, this study also provides a useful basis for further research on topics like factors that affect patients' self-evaluated disease severity and efficacy of interventions specific for the two different pain patterns associated with knee OA.

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“…In addition, the factorial validity of the WOMAC has not been supported in the recent literature. 8,9,18,42,47 The SF-36 physical function subscale has limited use on subjects with lower levels of functioning 23 and institutionalized individuals, 10 and has limited reliability for use on an individual level. 10 The Lower Extremity Functional Scale (LEFS) is a self-report measure designed to assess the functional status of patients with any musculoskeletal condition related to the lower extremity ( ).…”

mentioning

confidence: 99%

Reliability, Validity, and Responsiveness of the Lower Extremity Functional Scale for Inpatients of an Orthopaedic Rehabilitation Ward

Yeung¹,

Wessel²,

Stratford³

et al. 2009

J Orthop Sports Phys Ther

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The ICC of the LEFS was 0.88, and the SEM was 4 LEFS points (LEFS score range, 0-80). The change in LEFS correlated with changes of comparison measures in the same direction of improvement. Patients rated as improved by both themselves and their therapists had significantly larger change in LEFS scores than subjects rated as no change. The SRM of the LEFS from admission to discharge was 1.76 on patients rated as improved.The LEFS is reliable and valid to assess group and individual change, and has large responsiveness. The LEFS and the comparison measures likely assess different constructs.

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Validation of the Western Ontario and McMaster University Osteoarthritis Index in Asians with Osteoarthritis in Singapore

Abstract: The WOMAC is a valid and reliable outcome measure in Asian patients with OA in Singapore.

Cited by 92 publications

References 11 publications

Validating Self-Report Measures of Pain and Function in Patients Undergoing Hip or Knee Arthroplasty

Validating Self-Report Measures of Pain and Function in Patients Undergoing Hip or Knee Arthroplasty

A qualitative study on patients with knee osteoarthritis to evaluate the influence of different pain patterns on patients’ quality of life and to find out patients’ interpretation and coping strategies for the disease

Reliability, Validity, and Responsiveness of the Lower Extremity Functional Scale for Inpatients of an Orthopaedic Rehabilitation Ward

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