Consider the lumbrical with Carpal Tunnel splints

It is common to splint CTS cases as part of a conservative treatment plan and for the patient to wear the splint while they are sleeping  in order to maintain a wrist position that reduces median nerve pressure  through the carpal canal. The accepted splint for a CTS case is generally considered to be a wrist immobilization type splint with the wrist in neutral (0°). This is good for the wrist position but it does not address lumbrical incursion forces when the hand is in composite flexion. One option to address this issue is to fabricate a  wrist immobilization type splint with the wrist in neutral (0°) and the MP's blocked into extension. This splint option will limit FDP excursion enough to prevent full lumbrical incursion into the carpal canal. Due to the more restrictive nature of this splint it is not appropriate in all cases.