Hello @emptynose, Welcome to Connect. I see that your question is for @swiss who has not posted since last year and may no longer be following Connect. You may want to read through the post in this discussion specific to sinus surgery to see if you can related to what other members have shared.

Post Surgical Nasal Sinus Dysfunction/ENS: https://connect.mayoclinic.org/discussion/post-surgical-nasal-sinus-dysfunctionens/

I don't think I've ever seen any information on stem cell therapy related to post sinus surgery that will help. You mentioned you think stem cell therapy will help. Have you seen any clinical studies where the results were positive that it helped?