Difference of foot posture in two cases of exercise-induced foot dystonia

摘要

Limb dystonias are characterized by involuntary abnormal twisting, curling or other patterned movements and postural abnormalities of the involved limb. When this abnormal movement is linked to a specific task, the condition is called a task-specific dystonia of that limb [1]. Symptoms of dystonia appear to be action induced in the majority of reported cases [2]. Adult-onset focal dystonias usually involve learned, automated types of movements like writing and playing musical instruments. Drug-induced dystonias, Parkinson's disease, levodopa treatment-induced dyskinesias and psychogenic conditions are among the most common causes considered in the differential diagnosis [3]. Nerve conduction studies as well as EMG are useful to rule out peripheral nerves or muscle conditions.