Hi everybody!!
My arm is now ok!!!!
It took few months with physiotherapy, but I'm better! Not perfect, but better...
I'm now able to play guitar for short period. I didn't try to scroll because I'm really busy (we adopted a puppy and he has a lot of energy...). I plan to start soon. My physiotherapist suggested me to make 5 to 10 minutes max of scrolling to start. And increase progressively... I'm so glad that I didn't need surgery for now!!!