Hello Hv,

Long time!

Yes, wondering what happened to you.

Please another help with a friend who is very young - 16 - and was diagnosed with bilateral sacroiliitis. They want to make him undergo surgery.

Is this from a trauma or infection?

Tell me anything you can and know on how to get him recovered please.

How it will have to be addressed depends on the cause.  Any additional information you can provide would really help.