• Caroline Voet, Bernard le Polain de Waroux, Patrice Forget, Ronald Deumens, and Etienne Masquelier.
• Rehabilitation Medicine, Université Catholique de Louvain, Brussels, Belgium ; Multidisciplinary Reference Unit for Chronic Pain, Université Catholique de Louvain, Brussels, Belgium.
• F1000Res. 2014 Jan 1;3:97.

BackgroundComplex Regional Pain Syndrome type 1 (CRPS-1) is a debilitating chronic pain disorder, the physiopathology of which can lead to dystonia associated with changes in the autonomic, central and peripheral nervous system. An interdisciplinary approach (pharmacological, interventional and psychological therapies in conjunction with a rehabilitation pathway) is central to progress towards pain reduction and restoration of function.AimThis case report aims to stimulate reflection and development of mechanism-based therapeutic strategies concerning CRPS associated with dystonia.Case DescriptionA 31 year old female CRPS-1 patient presented with dystonia of the right foot following ligamentoplasty for chronic ankle instability. She did not have a satisfactory response to the usual therapies. Multiple anesthetic blocks (popliteal, epidural and intrathecal) were not associated with significant anesthesia and analgesia. Mobilization of the foot by a physiotherapist was not possible. A multidisciplinary approach with psychological support, physiotherapy and spinal cord stimulation (SCS) brought pain relief, rehabilitation and improvement in the quality of life.ConclusionThe present case report demonstrates the occurrence of multilevel (peripheral and central) pathological modifications in the nervous system of a CRPS-1 patient with dystonia. This conclusion is based on the patient's pain being resistant to anesthetic blocks at different levels and the favourable, at least initially, response to SCS. The importance of the bio-psycho-social model is also suggested, permitting behavioural change.

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