FIG. 2.

Improvement BFMDRS (Burke‐Fahn‐Marsden Dystonia Rating Scale) movement score, categorized by percentage decrease in score at latest‐reported follow‐up. Some studies report multiple follow‐up moments. Letters a–c represent relapsing patients. For exact scores of patients see Table 1. a: Hutchison et al (2003). 8.2% improvement immediately postoperatively and relapsed at 5‐month follow‐up to a level 14.3% worse than baseline. b: Anca et al (2003), maximal improvement of 46.2% at 12‐month follow‐up, but the score had dropped to 33.3% improvement at 24‐month follow‐up. c: Cersosimo et al (2008). Maximal improvement of 76.2% at 3‐month follow‐up and showed relapsing at 60‐month follow‐up. At 96‐month follow‐up, the BFMDRS score had dropped to 19.1% worse than baseline. [Color figure can be viewed at wileyonlinelibrary.com]