Sunny, I do not see a specific rheumatology topic for Connect. But I did find these by searching for rheumatology or joints in the search window:

Here is something for bones joints and muscles:
https://connect.mayoclinic.org/group/arthritis-and-joint-conditions-268850/
This one about rheumatoid arthritis:
https://connect.mayoclinic.org/discussion/rheumatoid-arthritis-ra-introduce-yourself-and-meet-others/?pg=12#comment-332812
This one mentions rheumatology but just has 3 posts:
https://connect.mayoclinic.org/discussion/rheumatologicalneurological/?utm_campaign=search
And, if you look at the following web page it does list other (non Mayo Connect) forums if you are interested: https://www.healthline.com/health/rheumatoid-arthritis-forums#Reach-Out

That was as far as I got. Best, Hank