What Causes Middle And Ring Finger To Be Deformed In Fractured Wrist?

I suffered a comminuted fracture of my left wrist in 1998. Surgery was performed, placing a pie plate, screws, wires, etc. My recovery was average at best, and while cosmetically the wrist is ok, full function was never restored. Within the past 10 days, I have had 2 incidents in which I have made a sudden movement that have resulted in my middle and ring fingers being grossly deformed- I can make a fist, but am unable to lift those fingers in particular, and to a lesser degree my index finger much more than half-way. i can t fully open my left hand, having difficulty grabbing a glass, soda can, etc. I am assuming my problem is related to my original wrist injurt. Any thought on what I may have done to myself?