Three months after wrist fusion i still suffer from a lot of pain when gripping tightly(when grip pressure is released)and playing golf.Pain is mainly between the base of my thumb running up my forearm(radius).The whole idea of this operation was a stronger and pain free wrist.I had partial wrist fusion before after a motorcoss accident.
Its not clear which hand you are referring to, the one with the previous ulnar surgery?
Your numbness is in the distribution of the ulnar nerve, and the inability to flex these digits is also consistent with an ulnar nerve problem. The site affected may be difficult to pinpoint (the ulnar nerve runs from the armpit to the hand), but is most commonly affected at the elbow or wrist. The type of injury (a complete nerve transection or just compression or lack of myelin) has an impact on whether it will recover. Fully transected nerves have the worst prognosis. If the injury is more than a year old, it is unlikely that further recovery is going to occur. An EMG/nerve conduction study may give an indication of the type of injury and site of injury (and therefore prognosis), but the ulnar nerve is notoriously hard to study electrically. Further surgery is unlikely to be of any benefit.
An EMG/nerve conduction study, and further rehab may be the way to go from here