what cause spondylitis arthritis
Ankylosing spondylitis is a form of progressive arthritis due to chronic inflammation of the joints in the spine. Its name comes from the Greek words â ankylos, â meaning stiffening of a joint, and â spondylo, â meaning vertebra.nkylosing spondylitis is a form of progressive arthritis due to chronic inflammation of the joints in the spine. Its name comes from the Greek words â ankylos, â meaning stiffening of a joint, and â spondylo, â meaning vertebra.