The mediating role of pain cognitions and pain sensitivity in the treatment effect of perioperative pain neuroscience education in people undergoing surgery for lumbar radiculopathy.

Though perioperative pain neuroscience education (PPNE) positively influences patients' surgical outcomes, little is known about the mechanisms behind this treatment's success. Therefore, this study aims to evaluate the potential mediating role of pain cognitions and pain sensitivity in the treatment effect of PPNE on postoperative quality of life in people undergoing surgery for lumbar radiculopathy. This secondary analysis uses data from 120 participants of a randomized controlled trial who were randomized to receive either PPNE or perioperative biomedical education before undergoing surgery for lumbar radiculopathy. Quality of life was assessed 1 year post-surgery using the Short Form 36-item Health Survey physical (SF36-PC) and mental (SF36-MC) component scores. Potential mediators included pain cognitions (i.e., kinesiophobia, pain catastrophizing, and hypervigilance) and pain sensitivity (i.e., endogenous nociceptive modulation), assessed 6 weeks post-surgery. Mediation models were constructed using structural equation modeling, and 95% confidence intervals (CIs) were calculated using 10,000 bootstrap samples. Analyses show a significant total effect for PPNE (estimate=0.464, 95% CI [0.105, 0.825]) and a significant indirect effect via pain catastrophizing on the SF36-PC (estimate=0.124, 95%CI [0.001, 0.293]). No mediating effect was found through the remaining pain cognitions or pain sensitivity measures. Also, no potential mediators were identified for the treatment effect of PPNE on the SF36-MC. Our findings suggest that pain catastrophizing mediates the treatment effect of PPNE on physical health-related quality of life in people undergoing surgery for lumbar radiculopathy. PERSPECTIVE: This secondary analysis identified pain catastrophizing as a mediator for perioperative pain neuroscience education in people undergoing surgery for lumbar radiculopathy. More so, its findings indicate that this educational intervention can enhance the postoperative physical health-related quality of life of these patients by addressing their catastrophizing thoughts.

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