Abstract
Motor overflow refers to unintentional muscle contractions which accompany but are anatomically separate from primary involuntary dystonic movements. In the case of writer’s cramp, mirror movements are a form of overflow in which abnormal movements occur in the unoccupied affected hand while writing with the opposite unaffected hand. This phenomenon suggests the presence of more widespread abnormalities of motor control in patients with focal dystonia, possibly due to a loss of normal inhibitory mechanisms. When looked for in individuals with writer’s cramp, the appearance of mirror dystonia in the affected resting hand is common when writing with the opposite unaffected hand.
This chapter contains a video segment which can be found at the URL: https://doi.org/10.1007/978-1-60327-426-5_53
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Sitburana O, Wu LJC, Sheffield JK, et al. Motor overflow and mirror dystonia. Parkinsonism Relat Disord. 2009;15:758–61.
Espay AJ, Li J-Y, Johnston L, et al. Mirror movements in parkinsonism: evaluation of a new clinical sign. J Neurol Neurosurg Psychiatry. 2005;76:1355–9.
Merello M, Carpintiero S, Cammarota A, et al. Bilateral mirror writing movements (mirror dystonia) in a patient with writer’s cramp: functional correlates. Mov Disord. 2006;21:683–9.
Author information
Authors and Affiliations
Electronic Supplementary material
Writer's Cramp w. mirror movements.mp4 (MP4 17,400KB)
Clip 1: the patient attempts to write with her dominant right hand. She exhibits severe flexion dystonia of the right wrist and fingers with ipsilateral overflow to the elbow and shoulder regions. Writing is intermittently interrupted due to severe cramps in her right hand. Clip 2: the patient begins to write with her unaffected left hand and within seconds develops mirror dystonia in the right hand manifested by flexion of the right wrist and fingers.
Rights and permissions
Copyright information
© 2012 Springer Science+Business Media New York
About this chapter
Cite this chapter
Bhidayasiri, R., Tarsy, D. (2012). Writer’s Cramp with Mirror Movements. In: Movement Disorders: A Video Atlas. Current Clinical Neurology. Humana, Totowa, NJ. https://doi.org/10.1007/978-1-60327-426-5_53
Download citation
DOI: https://doi.org/10.1007/978-1-60327-426-5_53
Published:
Publisher Name: Humana, Totowa, NJ
Print ISBN: 978-1-60327-425-8
Online ISBN: 978-1-60327-426-5
eBook Packages: MedicineMedicine (R0)