Spinal CT study of 40 ankylosing spondylitis pts shows the most common site and region of intervertebral fusion were the posterior vertebrae of the middle thoracic region >50% halffused posterior vertebrae Th4–Th5 to Th7–Th8, followed by Cx, last lumbar https://t.co/HzJmpROJmr https://t.co/9qUwlGyBQz