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Post-operative patient-related risk factors for chronic pain after total knee replacement: a systematic review.

Post-operative patient-related risk factors for chronic pain after total knee replacement: a systematic review.
Author Information (click to view)

Wylde V, Beswick AD, Dennis J, Gooberman-Hill R,


Wylde V, Beswick AD, Dennis J, Gooberman-Hill R, (click to view)

Wylde V, Beswick AD, Dennis J, Gooberman-Hill R,

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BMJ open 2017 11 037(11) e018105 doi 10.1136/bmjopen-2017-018105
Abstract
OBJECTIVE
To identify postoperative patient-related risk factors for chronic pain after total knee replacement (TKR).

DESIGN
The systematic review protocol was registered on the International Prospective Register of Systematic Reviews (CRD42016041374). MEDLINE, Embase and PsycINFO were searched from inception to October 2016 with no language restrictions. Key articles were also tracked in the Institute for Scientific Information (ISI) Web of Science. Cohort studies evaluating the association between patient-related factors in the first 3 months postoperatively and pain at 6 months or longer after primary TKR surgery were included. Screening, data extraction and assessment of methodological quality were undertaken by two reviewers. The primary outcome was pain severity in the replaced knee measured with a patient-reported outcome measure at 6 months or longer after TKR. Secondary outcomes included adverse events and other aspects of pain recommended by the core outcome set for chronic pain after TKR.

RESULTS
After removal of duplicates, 16 430 articles were screened, of which 805 were considered potentially relevant. After detailed evaluation of full-text articles, 14 studies with data from 1168 participants were included. Postoperative patient-related factors included acute pain (eight studies), function (five studies) and psychosocial factors (four studies). The included studies had diverse methods for assessment of potential risk factors and outcomes, and therefore narrative synthesis was conducted. For all postoperative factors, there was insufficient evidence to draw firm conclusions about the association with chronic pain after TKR. Selection bias was a potential risk for all studies, as none were reported to be conducted at multiple centres.

CONCLUSION
This systematic review found insufficient evidence to draw firm conclusions about the association between any postoperative patient-related factors and chronic pain after TKR. Further high-quality research is required to provide a robust evidence base on postoperative risk factors, and inform the development and evaluation of targeted interventions to optimise patients’ outcomes after TKR.

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