<unk>  is a morbid consequence of untreated longstanding severe cervical<unk> l<unk>  arthritis (RA)–an inflammatory autoimmune<unk>  that attacks the ligaments, joints, and bones of the neck. Although the anterior subluxation of the atlantoaxial joint is the most common manifestation of the disorder, subluxation can also occur with posterior or vertical movement, and subaxial (below C2) joints can also be involved.
Rheumatoid disease of the spine
Spondylolysis
Spondylosis deformans
Neuropathic arthropathy
Axial spondyloarthritis
Ankylosing spondylitis
Spinal disc herniation
Vertebral osteomyelitis