What is atlanto axial instability?
What is atlanto axial instability?
Atlanto-axial instability (AAI) is a condition that affects the bones in the upper spine or neck under the base of the skull. The joint between the upper spine and base of the skull is called the atlanto-axial joint. In people with Down syndrome, the ligaments (connections between muscles) are “lax” or floppy.
What causes ADI?
One of the first findings that we learn to recognize in the radiographic evaluation of the cervical spine is an increase in the atlanto-dental interspace (ADI). This is often the result of an inflammatory arthropathy, with rheumatoid arthritis being the major cause.
How do you fix atlantoaxial instability?
Surgery is often aimed at fixing the instability by fusing vertebral segments together. Surgery is often aimed at fixing the instability by fusing vertebral segments together. In the case of C1-C2 instability, these two vertebrae are fused posteriorly to limit their amount of movement.
What causes atlantoaxial instability symptoms?
Trauma as the sole cause of atlantoaxial instability is a unique entity and usually the result of a disruption of the transverse, alar, or apical ligaments. This type of injury is commonly associated with head trauma. Fractures of C1 or C2 also are traumatic causes of atlantoaxial instability.
What are the symptoms of a misaligned Atlas?
Typical symptoms of an atlas misalignment or an atlas blockage are:
- headache and migraines.
- deafness, tinnitus or noise in the inner ear.
- pain in the jaw.
- neck pain or a stiff neck.
- extreme muscle stiffness and restricted shoulder movement.
- back pain in the lumbar spine as well as hip pain and pelvic misalignment.
Can you fix cervical instability?
A 2020 study says: “Spinal chiropractic manipulative therapy can be used to correct cervical instability,” joint disorders, dislocations of cervical vertebrae, and much more. Spinal manipulation is a safe and effective therapy when performed by a highly qualified chiropractor, even in special needs patients.
How is Adi space measured?
The ADI is measured from the inferior border of the anterior tubercle of the C1 arch to the Odontoid process (Dens) of C2. The normal width is 1–5 mm for children & 1–3 mm (maximum) in adults. This space may increase in old age as a response to degeneration of the atlantodental joint complex.
What are alar ligaments?
In anatomy, the alar ligaments are ligaments which connect the dens (a bony protrusion on the second cervical vertebra) to tubercles on the medial side of the occipital condyle.
Is atlantoaxial instability good?
Prognosis is good for patients with symptomatic AAI in whom posterior spinal fusion is successful and function returns. Surgery may relieve pain, decrease myelopathy, or both in many patients, with results depending on the severity of symptoms and the cause of instability.
Which brace is used in atlantoaxial instability?
Initially, these patients are treated with a halo brace; however, if this treatment is unsuccessful because of a fixed deformity or recurrent deformity, posterior fusion of C1-2 is required. Posterior cervical spinal fusion can successfully treat symptomatic AAI in many cases.
How do you test for atlantoaxial instability?
The patient is asked to slowly flex the head performing a slight cervical nod, at the same time the examiner presses posteriorly on the patient’s forehead. A sliding motion of the head in relation to the axis indicates atlantoaxial instability.
What happens atlantoaxial subluxation?
Atlantoaxial instability (AAI), also known as atlantoaxial subluxation, is radiologically identified increased mobility or laxity between the body of the first cervical vertebra (atlas) and the odontoid process of the second cervical vertebra (axis) (see the image below).
Which is the best description of atlantoaxial instability?
Atlantoaxial instability. Atlantoaxial instability or Atlanto-axial instability (AAI) is characterized by excessive movement at the junction between the atlas (C1) and axis (C2) as a result of either a bone or ligament abnormality.
How big should the Adi be for atlantoaxial instability?
Radiographs flexion-extension xrays atlanto-dens interval (ADI) measurement distance between odontoid process and the posterior border of the anterior arch of the atlas. adult parameters > 3.5mm considered unstable. > 10mm indicates surgery in RA.
Is the atlantoaxial joint a transitional zone?
The atlantoaxial joint is an important “transitional zone” in the cervical spine. prone to instability by both degenerative and traumatic processes.
What is the definition of atlantoaxial dislocation?
Atlantoaxial dislocation refers to a loss of stability between the atlas and axis (C1–C2), resulting in loss of normal articulation (Fig. 1). The atlantoaxial joints can lose stable articulation from traumatic, inflammatory, idiopathic, or congenital abnormalities.
