I'm very interested in this thread. I injured my wrist a few years ago after falling off my horse (initial thoughts were broken but various x-rays and eventually a scan over a period of 1.5years ruled this out) and although it's pretty much healed, I still do get fluid collecting on the top of my wrist every now and then and it's incrediably painful. It never forms an actual cyst, but perhaps it's the same thing? At the time when it was incrediably painful, I too lost some dexterity in my wrist. my orthopaedic consultant blamed it on soft tissue damage and i was forced to rest it for 6-12mnths. It did the trick and it's certainly better than it was at the time, with now only occaisional pain after something particularly stressful (eg. a fall etc).