The AEQ has shown as a reliable and valid measure to assess pattern of fear-avoidance and endurance-related responses to pain. Both aspects seem to play a role in the maintenance of LBP.

Recent research has found individual differences in back pain patients due to behavioral avoidance vs persistence. However, there is a lack of prospective studies of nonspecific low back pain patients. The avoidance-endurance model (AEM) suggests at least 3 pathways leading to chronic pain: fear-avoidance response, distress-endurance response, and eustress-endurance response. We sought to compare these 3 maladaptive subgroups with an adaptive group using a classification tool that included the following scales: the thought suppression and behavioral endurance subscale of the Avoidance-Endurance Questionnaire and the Beck Depression Inventory. The psychological characteristics, and pain and disability of the AEM subgroups were investigated. We report results from 177 patients with subacute nonspecific low back pain at the start of outpatient treatment and at follow-up after 6 months. At baseline, a multivariate analysis of variance found that the fear-avoidance patients scored higher in pain catastrophizing than the other groups. The distress-endurance patients displayed elevated anxiety/depression and helplessness/hopelessness accompanied with the highest scores in the classification variables thought suppression and persistence behavior. The eustress-endurance patients had the highest humor/distraction scores, pain persistence, and positive mood despite pain. All 3 maladaptive groups revealed a higher pain intensity than the adaptive patients at follow-up after 6 months; however, disability at follow-up was elevated only in the fear-avoidance and distress-endurance patients. The study provides preliminary evidence for the construct and prospective validity of AEM-based subgroups of subacute, nonspecific back pain patients. The results suggest the need for individually targeted cognitive behavioral treatments in the maladaptive groups.

BackgroundThe Tampa Scale for Kinesiophobia (TSK), an instrument for measuring fear of movement/(re)injury, has been confirmed as an important predictor for the persistence of pain-related disability. The aims of this study were to evaluate the psychometric properties of a German version of the TSK (TSK-GV), examining aspects of content validity with special focus on fear-avoidance and endurance, and to confirm criterion-related validity in patients with low back pain (LBP).MethodsA total of 191 patients with LBP were included in this study. Several models with different factor structures from published studies were compared in a confirmatory factor analysis. Internal consistencies of the TSK-GV and its subscales were examined, and correlations with related self-report measures were calculated.ResultsThe internal consistency of the TSK-GV was α = 0.73. A two-factor model with 11 items was found to be the best fit for our data. The two factors were labelled Somatic Focus (SF) and Activity Avoidance (AA). The total score, SF and AA revealed moderate to high correlations with other fear-avoidance variables.ConclusionsThe TSK-GV is a reliable and valid measure for assessing the fear of movement/(re)injury.Electronic supplementary materialThe online version of this article (doi:10.1186/1471-2474-15-280) contains supplementary material, which is available to authorized users.

20 years of research, several qualitative reviews and a recently published systematic review of 37 good-quality prospective studies regarding the role of psychological, biomedical, social and objective occupational factors in the process of chronicity of back pain revealed that psychological factors are significantly related to the onset of back pain as well as to the development of chronic pain. Furthermore, the psychological factors displayed more predictive power than biomedical or biomechanical variables. As a consequence for clinical practice, these psychological risk factors have to be considered as "yellow flags" if a back pain problem won't respond to medical treatment for more than four weeks. As a further consequence, special risk factor - based psychosocial interventions should be offered in addition to the medical treatment to patients with high psychological risk factors for the development of chronic pain. The efficacy of such an interdisciplinary care in the very early phases of back pain in order to prevent chronicity of pain and disability has been published recently by our group.

• Low back pain is a major public health problem with high direct and indirect back-pain-related costs. • Chronic low back pain is a disabling disease which restricts quality of life. • Psychological factors may have a larger impact on disability and quality of life than pain itself. • The recurrent course of low back pain highlights the importance of multidisciplinary pain management even during acute exacerbations of pain.