Characterization of Manual Dexterity by Finger Force Manipuladum (FFM) in Patients With Writer's Cramp and in Control Subjects

Inclusion criteria

for patients with writer's cramp

• Patient with writer's cramp and writing speed <140 letters / min
• Writer's cramp focal dystonia specific to the task of writing
• Patient treated or not with botulinum toxin injection
• Person having attended school in French

Non inclusion criteria for patients with writer's cramp

• Patients whose writer's cramp has no impact on the handwriting and has kept a writing speed> 140 letters per minute.
• Tremor of writing
• Neurological condition other than writer's cramp (eg Parkinson's syndrome)
• Pain, trauma or pathology of the upper limb of the writing member other than the writer's cramp who required medical or surgical treatment in the last 6 months preceding the initial check-up

Inclusion criteria

for control subjects

•> 18 years old

• Without writer's cramp
• Person having attended school in French

Non inclusion criteria for control subjects

• Tremor of writing
• Neurological condition other than writer's cramp (eg Parkinson's syndrome)
• Pain, trauma or pathology of the upper limb of the writing member other than the writer's cramp who required medical or surgical treatment in the last 6 months preceding the initial check-up

Matching criteria between cases and control patients

• Age (± 5 years)
• Gender
• Hand writing