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Updated: Dec 10, 2025
Measurement & Analysis of the Temporal Discrimination Threshold Applied to Cervical Dystonia
Published on: January 27, 2018
Clinical and Demographic Characteristics of Upper Limb Dystonia
Scott A Norris1, Hyder A Jinnah2, Christine Klein3
1Departments of Neurology and Radiology, Washington University School of Medicine, St. Louis, Missouri, USA.
Background:
Knowledge of characteristics in upper limb dystonia remains limited, derived primarily from small, single-site studies.
Objective:
The objective of this study was to characterize demographic and clinical characteristics of upper limb dystonia from the Dystonia Coalition data set, a large, international, multicenter resource.
Methods:
We evaluated clinical and demographic characteristics of 367 participants with upper limb dystonia from onset, comparing across subcategories of focal (with and without dystonia spread) versus nonfocal onset.
Results:
Focal onset occurred in 80%; 67% remained focal without spread. Task specificity was most frequent in this subgroup, most often writer's cramp and affecting the dominant limb (83%). Focal onset with spread was more frequent in young onset (<21 years). Focal onset occurred equally in women and men; nonfocal onset affected women disproportionately.
Conclusions:
Upper limb dystonia distribution, focality, and task specificity relate to onset age and likelihood of regional spread. Observations may inform clinical counseling and design, execution, and interpretation of future studies. © 2020 International Parkinson and Movement Disorder Society.
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