A similar thing happened to me—I actually cut off the tip of my LH ring finger, about 1/3 of that last joint. It healed many years ago but the tip of that finger is pretty much scar tissue that will never develop a callu, so that fingertip is always a little tender. I have learned to substiture my little finger f
or the ring finger and it now works perfectly well. In the situations where a full chord is a must I can go ahead and fret it with that hand using the ring finger and it works ok. I couldn’t’t use that ring finger like that a lot but occasioally. The song New Camptown Races comes to mind where at one place a full G shape is required and I go ahead and fret the D string with that ring finger and it works well. There are a couple of other places where the only way to do it is to just go ahead and use that ring finger, and as an occasional thing I can do it, I rarely even think about it anymore. Django Reinhardt had all his left hand fingers burnt off and he is the #1 Gypsy jazz guitar player in the world! So I can’t complain.