Cervical vertebral erosions and subluxations in rheumatoid arthritis and ankylosing spondylitis.

Atlanto-axial and lower cervical subluxations are frequently present in rhematoid arthritis and ankylosing spondylitis. Vertebral erosions, particularly of the odontoid process, can often be demonstrated. Rheumatoid involvement of the occipito-atlanto-axial joints may cause a vertical translation of the cervical spine with respect to the skull; at times, this is associated with true basilar invagination. Subluxation atlanto-axial e infero-cervical es frequentemente presente in arthritis rheumatoide e in spondylitis ankylosante. Erosion vertebral, particularmente in le process0 odontoide, es frequentemente demonstrabile. Le affection rheumatoide del articulationes occipitoatlanto-axial pote causar un translation del spina cervical con respecto a1 cranio. A vices isto es associate con ver invagination basilar.