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M43.4 – Atlantoaxial Subluxation: Causes & Treatment
M43.4 is the ICD-10 code for other habitual atlantoaxial subluxation, referring to recurrent or chronic displacement between the first and second cervical vertebrae.
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M43.4 is the ICD-10 code for other habitual atlantoaxial subluxation, referring to recurrent or chronic displacement between the first and second cervical vertebrae.
What Does the ICD-10 Code M43.4 Mean?
The ICD-10 code M43.4 refers to Other Habitual Atlantoaxial Subluxation. This describes a recurrent or chronic displacement (subluxation) between the first cervical vertebra (Atlas, C1) and the second cervical vertebra (Axis, C2). This region is known medically as the atlantoaxial joint and is essential for the rotational movement of the head.
Causes
Habitual atlantoaxial subluxation can result from several underlying conditions:
- Congenital connective tissue weakness, for example in Down syndrome (Trisomy 21)
- Rheumatic and inflammatory diseases, particularly rheumatoid arthritis
- Traumatic injuries to the cervical spine
- Ligamentous instability (weakness of the ligaments holding the atlas and axis in place)
- Infections of the throat or cervical spine region (Grisel syndrome)
Symptoms
Symptoms of atlantoaxial subluxation vary depending on the degree of displacement:
- Neck pain and restricted movement
- Headaches, particularly at the base of the skull
- Dizziness or balance disturbances
- Tingling or numbness in the arms or hands
- In severe cases: spinal cord compression with neurological deficits
Diagnosis
Diagnosis is confirmed through imaging studies:
- X-ray of the cervical spine in different positions (e.g., flexion and extension views)
- Computed tomography (CT) for detailed visualization of bony structures
- Magnetic resonance imaging (MRI) to assess the spinal cord, ligaments, and soft tissues
An important diagnostic criterion is the atlantodental interval: a distance of more than 3 mm in adults or more than 5 mm in children is considered pathological.
Treatment
Conservative Treatment
In mild cases, non-surgical management is the first-line approach:
- Immobilization with a cervical orthosis (neck collar)
- Physiotherapy to strengthen neck and cervical muscles
- Pain management with anti-inflammatory medications
- Treatment of the underlying condition (e.g., rheumatological therapy)
Surgical Treatment
In cases of severe instability, spinal cord compression, or failure of conservative therapy, surgical stabilization may be required:
- Atlantoaxial fusion (spondylodesis): surgical fixation of the atlas and axis
- Decompression surgery in the presence of neurological deficits
References
- World Health Organization (WHO): ICD-10 International Statistical Classification of Diseases and Related Health Problems, 10th Revision, Code M43.4.
- Fielding JW, Hawkins RJ. Atlanto-axial rotatory fixation. J Bone Joint Surg Am. 1977;59(1):37–44.
- Pang D, Li V. Atlantoaxial rotatory fixation: Part 1. Biomechanics of normal rotation at the atlantoaxial joint in children. Neurosurgery. 2004;55(3):614–626.
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