I smashed my thumb joint a few years ago and lost my medical temporarily. The letter from the CAA said that they'd review it when I asked them. So off to the company doctor as soon as the surgeon (I really smashed it!) said so - quick check and a bit of resistance exercise by said doc (also whilst still undergoing physio personally) - quick call to the CAA and job done. Nothing to worry about - as long as it heals ok.