Evidence map›Paper›PMID 32453429›Full record

ArticlePhysical therapy2020

The WOMAC Pain Scale and Crosstalk From Co-occurring Pain Sites in People With Knee Pain: A Causal Modeling Study.

Daniel L Riddle, Robert A Perera

Open access · bronzeAbstract read
In one paragraph

Article in Physical therapy, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 18 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
18citing papers in PubMed, 1 pooled it
1.8field-weighted citation impact, top 15% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

18 citing papers in PubMed, 1 synthesis or guideline pooled it, 28 citations in OpenAlex.

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  6. Comparative outcome analyses of stromal vascular fractionWorld journal of experimental medicine · 2025
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

2 authors at 1 institution in 1 country.

Daniel L RiddleDepartment of Biostatistics, Virginia Commonwealth University, Richmond, VA 23298-0224 USA.
Robert A PereraDepartment of Biostatistics, Virginia Commonwealth University, Richmond, VA 23298-0224 USA.
Virginia Commonwealth University · US

Funding

DATA COORDINATING CENTER FOR THE OSTEOARTHRITIS INITIATIVE-264022258N01AR022258 · NIAMS · UNIVERSITY OF CALIFORNIA SYS OFFICE/PRES · 2003 to 2003
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CLINICAL CENTERS FOR THE OSTEOARTHRITIS INITIATIVE-264022259-264022259N01AR022259 · NIAMS · UNIVERSITY OF MARYLAND AT BALT · PI HOCHBERG, MARC C. · 2002 to 2006
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CLINICAL CENTERS FOR THE OSTEOARTHRITIS INITIATIVE-N01AR22260N01AR022260 · NIAMS · UNIVERSITY OF PITTSBURGH · PI KWOH, KENT · 2002 to 2006
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CLINICAL CENTERS FOR THE OSTEOARTHRITIS INITIATIVE-N01AR22261N01AR022261 · NIAMS · OHIO STATE UNIVERSITY RESEARCH · PI JACKSON, REBECCA · 2002 to 2006
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CLINICAL CENTER FOR THE OSTEOARTHRITIS-264022262-264022262N01AR022262 · NIAMS · THE MEMORIAL HOSPITAL · PI ASSAF, ANNLOUISE R. · 2002 to 2006
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NIAMS NIH HHS N01 AR022258NIAMS NIH HHS N01 AR022259NIAMS NIH HHS N01 AR022260NIAMS NIH HHS N01 AR022261NIAMS NIH HHS N01 AR022262
6 · The paper itself

Abstract

objectiveThe Western Ontario and McMaster Universities Osteoarthritis (WOMAC) pain scale quantifies knee pain severity with activities of daily living, but the potential impact of pain in other body regions on WOMAC pain scores has not been explored using a causal modeling approach. The purpose of this study was to determine if pain in other areas of the body impact WOMAC pain scores, a phenomenon referred to as "crosstalk."

methodsCross-sectional datasets were built from public use data available from the Osteoarthritis Initiative (OAI) and the Multicenter Osteoarthritis Study (MOST). The WOMAC Pain Scale and generic hip, knee, ankle, foot and back pain measures were included. Three nested regression models grounded in causally based classical test theory determined the extent of crosstalk. Improvements in the coefficient of determination across the 3 models were used to determine the presence of crosstalk.

resultsCausal modeling provided evidence of crosstalk in both OAI and MOST datasets. For example, in OAI, multiple statistical models demonstrated significant increases in coefficient of determination values (P < .0001) as additional pain areas were added to the models.

conclusionsCrosstalk appears to be a clinically important source of error in the WOMAC Pain Scale, particularly for patients with a larger number of painful body regions and when contralateral knee joint pain is more severe. IMPACT STATEMENT: This study has important implications for arthritis research. It also should raise clinician awareness of the threat to score interpretation and the need to consider the extent of pain in other body regions when interpreting WOMAC pain scores.

Indexed as

Disability EvaluationSeverity of Illness IndexActivities of Daily LivingArthralgiaCross-Sectional StudiesFemaleHumansMalePain MeasurementSymptom Assessment

Identifiers

PMID32453429
PMCPMC7530574
OpenAlexW3031673144

What OpenQuestion holds

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Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.