Oh, my. What an awful thing to happen to a pianist who is active in the hobby.
I was assigned piano as physiotherapy for my injured third finger of the right hand. There was no physician involved in this decision. The GP's job in 1953 was limited to stiching up the pad of my finger so the scar tissue would heal over the bone. but I never used it again without "helping" it with the fourth finger. My third grade teacher five years later noticed my habit, and discussed it with my Mother.
Mother started me on the John Schaum Pre book, which is beneath you, and Schmitt exercises, which are not. I used to do 15 minutes of Schmitt exercises a day, often reading a novel at the same time after I had memorized this week's exercise. They are very redimentary,at home position with no stretching, They can be downloaded from this website I believe. Schmitt exercises are great on making sure that all the fingers work evenly.
Heal well.