caa a22 4500 445832959 CHVBK 20180317145321.0 cr unu---uuuuu 170323e20111001xx s 000 0 eng 10.1007/s00586-011-1709-6 doi (NATIONALLICENCE)springer-10.1007/s00586-011-1709-6 Leg pain and psychological variables predict outcome 2-3years after lumbar fusion surgery [Elektronische Daten] [Allan Abbott, Raija Tyni-Lenné, Rune Hedlund] Prediction studies testing a thorough range of psychological variables in addition to demographic, work-related and clinical variables are lacking in lumbar fusion surgery research. This prospective cohort study aimed at examining predictions of functional disability, back pain and health-related quality of life (HRQOL) 2-3years after lumbar fusion by regressing nonlinear relations in a multivariate predictive model of pre-surgical variables. Before and 2-3years after lumbar fusion surgery, patients completed measures investigating demographics, work-related variables, clinical variables, functional self-efficacy, outcome expectancy, fear of movement/(re)injury, mental health and pain coping. Categorical regression with optimal scaling transformation, elastic net regularization and bootstrapping were used to investigate predictor variables and address predictive model validity. The most parsimonious and stable subset of pre-surgical predictor variables explained 41.6, 36.0 and 25.6% of the variance in functional disability, back pain intensity and HRQOL 2-3years after lumbar fusion. Pre-surgical control over pain significantly predicted functional disability and HRQOL. Pre-surgical catastrophizing and leg pain intensity significantly predicted functional disability and back pain while the pre-surgical straight leg raise significantly predicted back pain. Post-operative psychomotor therapy also significantly predicted functional disability while pre-surgical outcome expectations significantly predicted HRQOL. For the median dichotomised classification of functional disability, back pain intensity and HRQOL levels 2-3years post-surgery, the discriminative ability of the prediction models was of good quality. The results demonstrate the importance of pre-surgical psychological factors, leg pain intensity, straight leg raise and post-operative psychomotor therapy in the predictions of functional disability, back pain and HRQOL-related outcomes. Springer-Verlag, 2011 Disability nationallicence Pain nationallicence Predictors nationallicence Quality of life nationallicence Spinal fusion nationallicence Abbott Allan Department of Physical Therapy, Karolinska University Hospital, Huddinge, 141 86, Stockholm, Sweden aut Tyni-Lenné Raija Department of Physical Therapy, Karolinska University Hospital, Huddinge, 141 86, Stockholm, Sweden aut Hedlund Rune Department for Orthopaedics, Institute for Clinical Sciences, Sahlgrenska University Hospital, 41345, Gothenburg, Sweden aut European Spine Journal Springer-Verlag 20/10(2011-10-01), 1626-1634 0940-6719 20:10<1626 2011 20 586 https://doi.org/10.1007/s00586-011-1709-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00586-011-1709-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Abbott Allan Department of Physical Therapy, Karolinska University Hospital, Huddinge, 141 86, Stockholm, Sweden aut NATIONALLICENCE 700 1- Tyni-Lenné Raija Department of Physical Therapy, Karolinska University Hospital, Huddinge, 141 86, Stockholm, Sweden aut NATIONALLICENCE 700 1- Hedlund Rune Department for Orthopaedics, Institute for Clinical Sciences, Sahlgrenska University Hospital, 41345, Gothenburg, Sweden aut NATIONALLICENCE 773 0- European Spine Journal Springer-Verlag 20/10(2011-10-01), 1626-1634 0940-6719 20:10<1626 2011 20 586 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer