• Francisco M Kovacs, Jesús Seco, Ana Royuela, Andrés Peña, Alfonso Muriel, and Spanish Back Pain Research Network.
• Fundación Kovacs, Palma de Mallorca, Spain. kovacs@kovacs.org
• Spine. 2011 Feb 15;36(4):339-45.

Study DesignCorrelation between variables measured with previously validated instruments.ObjectiveTo explore the association between catastrophizing and disability in patients treated for subacute or chronic low back pain (LBP) within routine clinical practice in Spain.Summary Of Background DataThe influence of psychological variables on LBP-related disability in Southern Europe is different to the one in the Anglo-Saxon and Northern European cultural environments. In Spanish LBP patients, the influence of fear avoidance beliefs on disability is negligible, and catastrophizing does not mediate the improvement of disability caused by active education. The association between catastrophizing and dis-ability is unknown.MethodsThirty-three clinicians working for the Spanish National Health Service in 6 primary care and 8 specialty centers, recruited 1461 patients seeking care for subacute and chronic LBP. Patients were assessed only once. A linear regression model was developed to assess the percentage of the variance of disability explained by gender, age, chronicity status, severity of LBP, severity of referred pain (referred pain down to the leg), catastrophizing, eligible for workers' compensation (yes/no), failed back surgery (yes/no), radiologic findings, and treatments.ResultsCorrelations among LBP, referred pain down to the leg, disability, and catastrophizing were moderate, but significant. The strongest one was between disability and catastrophizing (r ∇ 0.520). Catastrophizing explained 28% of disability, whereas severity of LBP only 3%. Global adjusted R of the model was 0.387. There was an association between some radiologic findings and treatments, and slightly higher levels of disability.ConclusionIn Southern European subacute and chronic LBP patients, catastrophizing correlates with dis-ability and explains approximately one-fourth of its variance. Further studies should assess its value as a prognostic factor in subacute and chronic patients.

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