I work for an insurance company, most of our beneficiaries are medicare age, but many of them are prescribed the dynasplints. We have closely monitored their use over the past 3 years and they can be effective in treatment, it just depends on the contracture. If you don't see results in the first few months you will not see results, no matter what the reps tell you. We have definately found that out. We have seen the best results with new contractures, such as strokes or head injuries, I would think if driving his chair has agrivated the situation it would help, but if he is going to continue to drive the chair a dynasplint is not for long term use, they are only approved for use for about 3-6 mos usually, so that may not be the long term solution. Maybe using it to get out of the current contracture situation and then finding a better splint to use while driving the chair?
Hope this helps a bit