atlantoaxial joint

at·lan·to·ax·i·al joint

complex joint between first and second cervical vertebrae, consisting of the median and lateral atlantoaxial joints.

at·lan·to·ax·i·al joint

(at-lantō-aksē-ăl joynt) [TA]
Complex joint between first and second cervical vertebrae, consisting of the median and lateral atlantoaxial joints.


pertaining to the atlas and axis.

atlantoaxial joint
the articulation between the first two cervical vertebrae.
atlantoaxial membrane
the fibrous sheet which closes the interarcual space between the atlas and the axis.
atlantoaxial subluxation
degeneration or malformation of the dens is seen mainly in toy breeds of dogs predisposing to displacement of the axis. Fracture of the dens can occur in any animal. Compression of the cervical cord is a common sequel that causes neck pain and varying degrees of spastic tetraparesis. Treatment is surgical stabilization. Also reported in Holstein cattle.
References in periodicals archive ?
As in rheumatoid arthritis, atlantoaxial joint subluxation, atlantooccipital subluxation and upward subluxation of the axis may occur in AS as a consequence of instability resulting from the inflammatory process.
The TAL is the most important ligament, stabilizing the atlantoaxial joint against translational forces.
Involvement of the secondary stabilizers in RA results in progressive loss of stability of the atlantoaxial joint.
Severe muscle spasm of the neck secondary to osteomyelitis of the atlantoaxial joint.
Rotating and tilting the neck stretches the extracranial vertebral arteries and produces a shearing force on the portion of the arteries at the atlantoaxial joint that may produce intimal tearing, dissection or thrombus formation.
The primary stabilizer of the atlantoaxial joint is transverse, and the secondary stabilizers are the alar ligaments.
Computed tomography (CT) (figure 1) and magnetic resonance imaging (MRI) (figure 2) demonstrated findings consistent with a focal osteomyelitis in the right atlantoaxial joint.
To assess mobility and stability of the atlantoaxial joint, cervical motion studies were performed 3 months postoperatively.
10,11,24) It should be taken into consideration that the bursa in the atlantoaxial joint, after being inflamed, may lead to atlantoaxial subluxation.
With the use of a small dissector, the cranial surface of the lamina and isthmus of C2 were carefully exposed bilaterally to the posterior capsule of the atlantoaxial joint.
It is also possible that the ligaments supporting the atlantoaxial joints became misaligned or flaccid, and resulted in AAD.
Since the introduction of functional magnetic resonance imaging (fMRI) on an open magnet, it has been possible to observe the functional condition of the ligaments and the atlantoaxial joints on a video loop.