I am sorry to hear about your accident. It would be unusual for an orthopedic surgeon to cut all your tendons in fixing a forearm fracture. However, many of the flexor muscles in the forearm needs to be peeled off the bone to place a plate in the fractured bone. Sometimes during the healing process and also injury to the muscle caused by the force of the accident, the muscle can be damage. Without an evaluation, it is difficult for me to advise you if this function can return back to normal, but many times the function may be improved with therapy or further surgery. Sorry for the vague response, but again, it is difficult to assess the issue without an exam.
In Sok Yi, MD