This article includes supplementary video clips, available online at .

mds21377-MDS21377.mpg12420KSegment 1. The video shows the patient walking at different speeds before and after receiving 200 mg levodopa.Segment 2. The first sequence was taken after a 30-min walk without levodopa. Notice the clumsy movement of the left leg and the transient action-induced bending of the trunk forward and to the left. Depending on the walking speed, inward rotation of the left leg and supination of the left foot develop.Segment 3. The following sequences show the patient after receiving 200 mg levodopa. Shortly after the start (second sequence), minor residual symptoms are present with a clumsy left leg and a slight bending of the trunk. After a 30-min walk (third sequence), dystonic symptoms increase again.

Please note: Wiley Blackwell is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.