What is ankylosing spondylitis and how is it treated?

It is a : An autoimmune immunologic disease of skeletal system primarily affecting the spine that causes severe inflammation leading to pain & leads to an auto fusion of the spine which can lead to a deformity with the bone losing density & more susceptible to fracture due to stiffness & decreased density diagnosed by blood testing & x-rays with treatment range : pt & medication as well as surgery.