The type of surgery performed is specific to the type of dystonia that the patient has. A systematic review found that some patients benefit from deep brain stimulation (DBS) surgery, but the studies may have been subject to financial bias. Prevalence
The disease is more commonly found amongst Ashkenazi Jews. The occurrence of torsion dystonia in the Ashkenazi Jewish population as stated by the Department of Epidemiology and Public Health of Yale University School of Medicine in New Haven, Connecticut; "Reports dating to the beginning of this century describe Ashkenazi Jewish (AJ) families with multiple cases of ITD either in siblings (Schwalbe 1908; Bernstein 1912; Abrahamson 1920) or in parents and offspring (Wechsler and Brock 1922; Mankowsky and Czerny 1929; Regensberg 1930). The first comprehensive evaluation of the mode of inheritance of ITD in Jewish and non-Jewish families was described by Zeman and Dyken (1967), who concluded that the disorder was inherited as an autosomal dominant with incomplete penetrance in both populations. Although they concluded that the gene frequency was higher in the AJ population than in non-Jews, no difference in mode of inheritance or disease mechanism was construed." Research
A 1969 study of torsion dystonia patients found an average IQ 10 points higher than controls matched for age, sex and ethnic background. References
Further reading
https://web.archive.org/web/20060903085219/http://www.biochem.arizona.edu/classes/bioc461/Biochem499/AngelaPulsifer/dystonia1.htm
Risch, N. J.; Bressman, S. B.; Deleon, D; Brin, M. F.; Burke, R. E.; Greene, P. E.; Shale, H; Claus, E. B.; Cupples, L. A.; Fahn, S (1990). "Segregation analysis of idiopathic torsion dystonia in Ashkenazi Jews suggests autosomal dominant inheritance".
Cervical dystonia (spasmodic torticollis): A type of dystonia that affects the head, neck and spine. It can create problems by the characteristic turning of the head and neck from side to side. Blepharospasm:  This type of dystonia causes involuntary contraction of the eyelids. The main concern for this dystonia is that it can cause the eyelids to close involuntarily and for indefinite periods of time. Oromandibular dystonia: A dystonia of the jaw, lips, and/or the tongue. It can make eating and swallowing very complicated due to the jaw being held open or shut for periods of time. Spasmodic dysphonia: A dystonia of the vocal cords. The complications surrounding this form of dystonia are speech related and can cause symptoms such as speech that wavers, speech that sounds like a whisper, or speech that is hesitant. Writers cramp (occupational dystonia): A dystonia that affects the muscles of the hand and  forearm. It is triggered by attempting to write or execute other fine-motor hand functions. Orofacial-Buccal dystonia (Meiges or Brueghals Syndrome): A combination of blepharospasm and oromandibular dystonia. Early-onset torsion dystonia: The most severe type of  dystonia, it begins in an arm or leg and progresses to the rest of the body until the person — in most cases, a child — is reliant on a wheelchair. Treatment
There is no cure for torsion dystonia. However, there are several medical approaches that can be taken in order to lessen the symptoms of the disease.