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BioMed Research International
Volume 2014 (2014), Article ID 162754, 6 pages
http://dx.doi.org/10.1155/2014/162754
Research Article

Association between Severe Upper Limb Spasticity and Brain Lesion Location in Stroke Patients

1Neuromotor and Cognitive Rehabilitation Research Center, Department of Neurological and Movement Sciences, University of Verona, P.le L.A. Scuro 10, 37134 Verona, Italy
2Neurology Section, Department of Neurological and Movement Sciences, University of Verona, Verona, Italy
3Neurology Unit, Pederzoli Hospital, Peschiera del Garda, Italy
4Department of Neurology, Hochzirl Hospital, Zirl, Austria
5Research Unit of Neurorehabilitation, South Tyrol, Bolzano, Italy
6Department of Rehabilitation, Brunico Hospital, Brunico, Italy
7Neurorehabilitation Unit, Azienda Ospedaliera Universitaria Integrata, Verona, Italy

Received 10 April 2014; Revised 12 May 2014; Accepted 12 May 2014; Published 25 May 2014

Academic Editor: Lucio Marinelli

Copyright © 2014 Alessandro Picelli et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Association between the site of brain injury and poststroke spasticity is poorly understood. The present study investigated whether lesion analysis could document brain regions associated with the development of severe upper limb poststroke spasticity. A retrospective analysis was conducted on 39 chronic stroke patients. Spasticity was assessed at the affected upper limb with the modified Ashworth scale (shoulder, elbow, wrist, and fingers). Brain lesions were traced from magnetic resonance imaging performed within the first 7 days after stroke and region of interest images were generated. The association between severe upper limb spasticity (modified Ashworth scale ≥2) and lesion location was determined with the voxel-based lesion-symptom mapping method implemented in MRIcro software. Colored maps representing the statistics were generated and overlaid onto the automated anatomical labeling and the Johns Hopkins University white matter templates provided with MRIcron. Thalamic nuclei were identified with the Talairach Daemon software. Injuries to the insula, the thalamus, the basal ganglia, and white matter tracts (internal capsule, corona radiata, external capsule, and superior longitudinal fasciculus) were significantly associated with severe upper limb poststroke spasticity. Further advances in our understanding of the neural correlates of spasticity may lead to early targeted rehabilitation when key regions are damaged.