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Clinical Journal of Pain:
doi: 10.1097/AJP.0000000000000033
Original Articles

Pain and Recovery After Total Knee Arthroplasty: A 12-Month Follow-up After a Prospective Randomized Study Evaluating Nefopam and Ketamine for Early Rehabilitation

Aveline, Christophe MD*; Roux, Alain Le MD*; Hetet, Hubert Le MD*; Gautier, Jean F. MD*; Vautier, Pierre MD*; Cognet, Fabrice MD*; Bonnet, Francis MD, PhD

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Abstract

Objectives:

Ketamine and nefopam has been documented to decrease pain intensity and improve rehabilitation after total knee arthroplasty (TKA). We conducted a follow-up study of a previously randomized clinical trial to determine the prevalence and risk factors of chronic pain 1 year after TKA and to assess the role of perioperative administration of ketamine and nefopam.

Materials and Methods:

The original randomized, double-blind trial evaluated postoperative pain in 75 patients scheduled for TKA who received either a 48-hour infusion of ketamine or nefopam compared with placebo. The current study has evaluated patients at 6 and 12 months for the presence of chronic pain defined as a visual analogue scale ≥40 mm during a stair-climbing test. Other outcomes were incidence of neuropathic pain evaluated (DN4 score), active flexion of the knee, and functional outcome (KOOS-PS score).

Results:

A total of 69 patients completed the trial. The prevalence of chronic pain at 12 months was 17.4% (95% confidence interval [CI], 10.2%-27.9%) without difference between the ketamine (12.5%), nefopam (13.7%), and placebo groups (26.1%). Prevalence of neuropathic pain was 10.2% (95% CI, 3%-17.3%). Ketamine reduced DN4 scores (P=0.02), increased knee flexion (P=0.0007), and KOOS-PS scores (P<0.0001) compared with placebo. A visual analogue scale score ≥60 mm in the postoperative period was the only risk factor associated with the occurrence of chronic pain (odds ratio 4.54; 95% CI, 1.17-17.67).

Discussion:

After TKA, the intensity of postoperative pain is a risk factor of chronic pain on movement. Intraoperative ketamine seems to improve long-term results of rehabilitation in this setting.

Copyright © 2013 by Lippincott Williams & Wilkins

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