Reliability and responsiveness of measures of pain in people with osteoarthritis of the knee: a psychometric evaluation.
Katie V Turner, Bryan M Moreton, David A Walsh and 1 others
PMID 27027698WHAT IT FOUND
The ICOAP constant score stayed stable over time, and both ICOAP constant and intermittent scores changed clearly after knee replacement.
The McGill total score did not work as one overall pain score. Use its continuous, intermittent and neuropathic scores, not the affective items.
Key findings
01The SF-MPQ-2 total score did not behave as a single pain measure.
02In people without knee replacement, the ICOAP constant subscale and MPQ intermittent subscale showed substantial test-retest reliability.
03In people with knee replacement, effect sizes from baseline to six months ranged from 0.09 to 1.69.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
Only 255 of 1359 invited people provided baseline data, and 113 returned follow-up questionnaires, so the analysed sample was much smaller than the invited sample. The SF-MPQ-2 was part of a larger questionnaire set, so not everyone invited completed it. The retest interval was three months, and participants without surgery may have had other changes in care that affected scores. Responsiveness was assessed only in people who had knee replacement, so it may not apply to other treatments. The sample was recruited from UK NHS trusts and previous study contacts, which may limit generalisability to other settings.
The easy way to misread this
Do not treat the SF-MPQ-2 total score as a valid single overall pain score. It did not behave as a single pain construct, and the affective subscale did not provide usable Rasch conversion scores.