• Roelof M A W van Wijk, Jos W M Geurts, Richel Lousberg, Herman J Wynne, Edwin Hammink, Johannes T A Knape, and Gerbrand J Groen.
• Department of Anesthesia, The Queen Elizabeth Hospital, University of Adelaide, Adelaide, South Australia, Australia. roelof.vanwijk@nwahs.sa.gov.au
• Pain Med. 2008 Mar 1;9(2):212-21.

ObjectiveIn this post hoc observational study, we investigated psychological predictors of outcome after radiofrequency and injection treatments, commonly performed in the management of chronic low back pain (CLBP).Design & SettingData, comprising 161 patients (29 eventually lost to follow-up), were obtained from two randomized controlled trials on efficacy of radiofrequency treatment for back pain and sciatica. Subsequently patients were additionally treated in an open prospective follow-up period. Although all groups presented a significant visual analog scale reduction after 3 and 12 months, no additional pain relief after radiofrequency compared with injection treatment was found. Both trial populations showed sufficient similarities. A principal component (factor) analysis was performed on baseline psychometric tests, SF-36, and physical activity variables. We constructed five clinically relevant psychological profiles: "psychologically negative,"adaptive manager,"rigid qualities,"supporting partner," and "strong ego." These were examined as possible predictors of significant pain relief using logistic regression analysis.ResultsThe "psychologically negative" dimension showed a negative and the "adaptive manager" dimension a positive prognostic effect on outcome.ConclusionsMinimally invasive treatment for CLBP leads to significant pain reduction, including potential placebo effects. However, psychologically vulnerable patients, characterized by, among others, reduced life control, disturbed mood, negative self-efficacy, catastrophizing, high anxiety levels, inadequacy, and poor mental health, tend not to respond to this treatment. Patients characterized by a.o. reduced pain and interference levels, positive expectations, and reasonable physical and social functioning, react more favorably. From both a clinical and a financial perspective, psychosocial evaluation and selection of patients seems appropriate, before applying minimally invasive procedures for CLBP.

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