I went to a great talk yesterday from Dr Karen Langone, sports podiatrist, from Long Island, New York. Dr Langone is the President of the American Academy of Podiatric Sports Medicine. See their website at http://www.aapsm.org/ She was a great proponent for the Wii System by Nintendo with Balance Board as a way of Lower Extremity Rehabilitation. I am attaching a couple of links for you and will be investigating this further.
http://www.wii-hab.com/
http://wiihabtherapy.blogspot.com/2009/03/workshop-featuring-wii-ot.html
http://www.youtube.com/watch?v=c3DnFpe78YU&NR=1