My son was very severely injured at a showcase in August of his senior year. Some coaches cared and some didn't. A few wanted to delay a potential offer to the spring to make sure everything healed. We told everyone about the injury but we were very selective about discussing surgery. In every case I can think of we proactively told coaches (that didn't already know) that he had been injured and the nature of the injury. However, we only talked about surgery if we were specifically asked. I say "we" in this case because in a few instances a coach pulled me or my wife aside to ask about the injury without asking our son. The school that my son eventually committed to was present when the injury took place but that coach never asked about surgery just about the prospects of a full recovery which were better than excellent. I have my doubts if they would have offered if they knew about the operation but that is just conjecture. They never asked.
In the end my son threw so much harder AFTER surgery that he converted to pitcher and has had a great college career. So, everything works out in the end. The injury turned out to be a lucky break in sad and stressful way. Hang in there.