Suggest Treatment For Wrist Injury

Was in a cycling accident 9 1/2 weeks ago. Clean fracture of radial head and another clean fracture of the humerus right above the elbow. X-rays at ER taken of shoulder and wrist with no fractures apparent. Complaining of wrist, thumb, and finger pain after splint was put on by Ortho 5 days after accident. Went back to Ortho took additional wrist and hand x-rays show no fracture. Put a thumb spika on. 9 1/2 weeks later--elbow is healing well, most flexibility has returned to elbow. However, I can not bend my wrist back at all and there is sharp pain when gripping, pinching, or trying to twist (i.e. cannot twist door knob). Had an MRI which shows wrist joint capsule is inflamed along with inflammation of tendons. What is the treatment for this type of injury?