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Published in: Clinical Rheumatology 1/2021

01-01-2021 | Knee Osteoarthritis | Original Article

Measurement properties of Pain Catastrophizing Scale in patients with knee osteoarthritis

Authors: Wei Jie Ong, Yu Heng Kwan, Zhui Ying Lim, Julian Thumboo, Seng Jin Yeo, William Yeo, Steven B. Wong, Ying Ying Leung

Published in: Clinical Rheumatology | Issue 1/2021

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Abstract

Objectives

Pain catastrophizing impacts symptoms and outcomes for knee osteoarthritis (OA). We evaluated the internal consistency, content, construct and structure validity of the Pain Catastrophizing Scale (PCS) in patients with knee OA.

Methods

We evaluated content validity of PCS via cognitive interviews. We then recruited patients with knee OA enlisted for knee replacement (KR) surgery in a Singapore tertiary referral hospital for cross-sectional validation evaluation of PCS. Data was collected 2 weeks prior to KR. Analyses was guided by the COnsensus-based Standards for the selection of health Measurement INstruments (COSMIN) framework for internal consistency, construct validity and structure validity.

Results

Adequate content validity was confirmed from 10 patients in cognitive interviews. 675 (70.4% female, mean (standard deviation, SD) age = 65.52 (6.84) years) were included (91.7% total KR, 8.3% unicompartmental KR) in the cross-sectional study. The mean (SD) PCS score was 12.65 (10.55), with 0.14% and 8.63% ceiling and floor effects, respectively. PCS demonstrates high internal consistency (Cronbach’s alpha = 0.94). Construct validity was demonstrated by fulfilment of seven out of seven (100%) a priori hypotheses. PCS was strongly correlated with anxiety and depression, and moderately correlated with physical functioning and mental health domains of the short form 36 health survey (SF-36). Sensitivity analyses between Chinese and non-Chinese subgroups are generally consistent. From confirmatory factor analysis, the PCS model showed good fit for a second-order, three-factor structure (CFI = 0.965, TLI = 0.950, SRMR = 0.031).

Conclusions

This study supports internal consistency, construct validity and structural validity of PCS as a measure of pain catastrophizing in knee OA patients.
Key points
The PCS is validated for measuring pain catastrophizing in knee OA patients, for evaluation of possible link to post-KR surgery satisfaction outcomes and other purposes.
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Metadata
Title
Measurement properties of Pain Catastrophizing Scale in patients with knee osteoarthritis
Authors
Wei Jie Ong
Yu Heng Kwan
Zhui Ying Lim
Julian Thumboo
Seng Jin Yeo
William Yeo
Steven B. Wong
Ying Ying Leung
Publication date
01-01-2021
Publisher
Springer International Publishing
Published in
Clinical Rheumatology / Issue 1/2021
Print ISSN: 0770-3198
Electronic ISSN: 1434-9949
DOI
https://doi.org/10.1007/s10067-020-05163-8

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