Dystonia is the third most common neurological movement syndrome, affecting an estimated 40 000 people in the UK and more than 3 million people worldwide (Jinnah and Hess, 2008). The disorder is characterized by excessive involuntary muscle contractions that lead to twisting movements and unnatural postures, with or without tremor (Fahn et al, 1998). Although dystonia is a neurological disorder, it does not usually lead to problems with other functions of the brain such as cognition. The German neurologist Hermann Oppenheim first used the term ‘dystonia musculorum deformans’ in 1911; however, only one third of people affected by dystonia are known to be receiving medical treatment due to difficulties in recognizing and diagnosing the condition (Grant and Meager, 2005).
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