Here are a few excerpts from a short Reuters news article carried by Yahoo! (Link):

Virtual reality visual feedback cues can help people with multiple sclerosis (MS) to walk more quickly and lengthen their stride, Israeli researchers report.
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A virtual reality system that incorporates the user’s movements into a visual display that provides feedback has been shown to improve gait in patients with Parkinson’s.
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The findings support the use of virtual reality-based approaches to rehabilitation in patients with MS, as well as other types of neurological disorders, they conclude.

I wish there were more articles like this one; and more discussion and interest as well.