Bilateral sacroiliac joint surface density is increased, the boundary is unclear, and the joint space is a strip gas density shadow. Is this ankylosing spondylitis?

According to the examination results you provided, the situation is mainly a change caused by sacroiliac joint inflammation. Generally speaking, the common cause is the early change of ankylosing spondylitis. It is best to draw blood to check the symptoms, but pay attention to rest as much as possible to avoid fatigue and colds.