Ankylosing spondylitis is not limited to the sacro-iliac joints and the lumbar and dorsal spine, but may also affect the cervical spine. Forestier, Jacqueline, and Rotes-Querol (1951) considered that the intervertebral joints were first affected, osteo-porosis being followed by narrowing and ankylosis, and later by the formation of syndesmophytes on the vertebral bodies. Romanus and Yden (1955)...
