Dystonia is a disorder characterized by involuntary sustained muscle contractions resulting in twisting and repetitive movements or abnormal postures. Despite an incomplete understanding of the neurological mechanisms underlying dystonia, relief of dystonic posturing and associated pain and discomfort has improved markedly since the introduction of botulinum toxin (BTX) therapy in the late 1980s, so much so, it has become the standard therapy for focal dystonias.
via Dystonia Treatment using Botulinum Toxin (Botox R).
TBI Rehabilitation 