rheumatoid spondylitis वाक्य

With the condition, known as rheumatoid spondylitis, bone spurs slowly grow out of the backbone.
It is unclear if the source also implies that " spondyloarthropathy " is the same as ank spond and rheumatoid spondylitis.
The statement " " Dr . Erwin Kompanje . . . diagnosed a form of Spondylarthropathy ( also known as ( Ankylosing ) Spondylitis or Rheumatoid spondylitis ) in the 4th and 5th thoracic vertebrae " " seems to imply that ankylosing spondylitis and rheumatoid " spondylitis " are the same disease . ( The capitalisation is rather random . ) This is certainly not true.