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Freezing of shoulder flexion impeding boule throwing: A form of task-specific focal dystonia in petanque players


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During a period of intensive practice, 2 petanque players developed freezing of shoulder flexion impeding boule throwing. This movement disorder was consistent with the diagnosis of task-specific focal dystonia. Polymyography showed that freezing was associated with bursts of low amplitude. In the absence of motor or sensory deficits, a motor apraxia could be considered. © 2002 Movement Disorder Society