| atlantoaxial | <anatomy> Pertaining to the atlas and the axis; denoting the joint between the first two cervical vertebrae. Synonym: atlantoepistrophic, atloaxoid. (05 Mar 2000) |
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| atlantoaxial joint | <anatomy> Compound joint between first and second cervical vertebrae, the atlas and axis bones. (20 Jun 2000) |
| atlantoaxial subluxation | <radiology> Arthritic, rheumatoid arthritis, JRA, psoriatic arthritis, ankylosing spondylitis (late feature in 2%), lupus (systemic lupus erythematosus), congenital, Down syndrome (in 20%), Morquio disease, atlanto-occipital fusion, congenital absence/hypoplasia of dens (2/3 have history of trauma), infectious, retropharyngeal abscess, traumatic (12 Dec 1998) |
| median atlantoaxial joint | A pivot synovial joint between the dens of the axis and the ring formed by the anterior arch and the transverse ligament of the atlas. Synonym: articulatio atlantoaxialis mediana, Cruveilhier's joint, middle atlantoepistrophic joint. (05 Mar 2000) |
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| lateral atlantoaxial joint | A condylar synovial joint between the inferior articular facets of the atlas and the superior articular facets of the axis. Synonym: articulatio atlantoaxialis lateralis, lateral atlantoepistrophic joint. (05 Mar 2000) |