Hi, See A Couple Years Back I Was Stabbed On

Hi,
See a couple years back I was stabbed on the back of my hand, near the wrist joints. I I couldn't move none of my fingers and sometimes my hands would feel numb especially if a mosquito should bite me on it and I scratch it. Over the period of some months the wound began to heal and I started working out my fingers using a sponge ball. I thought everything would get back to normal but it didn't. More months started to pass by and the Ring finger and Middle finger started to return to normal, but the ring and the middle finger did not. Whenever I try to stretch my fingers out they would not level out. They (Ring finger and Middle finger) would stay inclined to the pinky finger as well as the index finger. Do you know what the issue is?

P.S. I think it's about 2 years now since this has happened and no change despite countless finger exercises.