Dystonia is a neurological movement disorder in which sustained muscle contractions cause twisting and repetitive movements or abnormal postures. This disease is very heterogeneous and can have many causes. Current treatments (drugs, pallidal stimulation) improve primary generalized dystonias; however they are ineffective for focal dystonias following brain damage. Cortex stimulation is a present and effective technique used in the treatment of chronic pain and could represent an interesting strategy to treat focal dystonias. This is the aim of the present study.
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Evaluation of dystonia by using the validated "Burke Fahn and Marsden (1985)" dystonia rating scale
Timeframe: before the chirurgical intervention and 2, 5, 6, 9 and 13 months after