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M43.5 Atlantoaxial Subluxation: Causes and Treatment
M43.5 is the ICD-10 code for other habitual atlantoaxial subluxation, a condition in which the first cervical vertebra (atlas) repeatedly shifts out of its normal position.
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M43.5 is the ICD-10 code for other habitual atlantoaxial subluxation, a condition in which the first cervical vertebra (atlas) repeatedly shifts out of its normal position.
What is M43.5?
The ICD-10 code M43.5 refers to other habitual atlantoaxial subluxations – a condition characterised by recurrent or persistent displacement of the first cervical vertebra (the atlas, C1) relative to the second cervical vertebra (the axis, C2). The joint between these two vertebrae is known as the atlantoaxial joint. A subluxation means the joint is partially out of alignment without being completely dislocated.
Anatomy and Background
The atlas (C1) is the topmost vertebra of the spine and directly supports the skull. It sits on the axis (C2), which features a bony projection called the dens (odontoid process). Together, these two vertebrae enable the rotational movement of the head. When their ligamentous or bony stability is compromised – due to injury, inflammation, or congenital factors – a subluxation can develop.
Causes
- Trauma: Falls, road traffic accidents, or sports injuries can damage the ligaments stabilising the atlantoaxial joint.
- Inflammatory conditions: Rheumatoid arthritis or ankylosing spondylitis can erode the stabilising structures of the cervical spine.
- Infections: The so-called Grisel syndrome describes a reactive atlantoaxial subluxation triggered by an infection in the head and neck region, particularly in children.
- Congenital anomalies: Down syndrome (Trisomy 21) is frequently associated with ligamentous laxity, predisposing patients to atlantoaxial instability.
- Habitual causes: Muscle imbalances or connective tissue weakness can lead to a recurring tendency toward subluxation.
Symptoms
- Neck pain and stiffness, often on one side
- Headaches, especially in the occipital (back of the head) region
- Abnormal head posture (torticollis, or wry neck)
- Restricted range of motion in the cervical spine, particularly rotation
- In severe cases: neurological symptoms such as numbness, tingling in the arms or hands, or rarely spinal cord compression
Diagnosis
Diagnosing an atlantoaxial subluxation requires a thorough clinical examination and appropriate imaging studies:
- X-ray of the cervical spine (including flexion-extension views if indicated)
- Computed tomography (CT) for detailed visualisation of bony structures
- Magnetic resonance imaging (MRI) to assess ligaments, nerves, and the spinal cord
A key measurement is the atlantodental interval (ADI) – the distance between the anterior arch of the atlas and the dens. An increased ADI indicates instability.
Treatment
Conservative Management
- Physiotherapy: Strengthening of the deep neck muscles and cervical stabilisation exercises
- Pain management: Non-steroidal anti-inflammatory drugs (NSAIDs), muscle relaxants
- Immobilisation: Soft or rigid cervical collar for temporary stabilisation and pain relief
- Treatment of the underlying condition: In inflammatory cases, addressing the primary disease is essential
Surgical Treatment
When conservative measures are insufficient or neurological complications are present, surgical intervention may be required. The most common procedure is an atlantoaxial fusion (spinal arthrodesis), in which C1 and C2 are surgically fixed together to provide permanent stability.
Prognosis
With early diagnosis and appropriate treatment, the prognosis is generally favourable. However, chronic or untreated cases can lead to permanent neurological damage, particularly if spinal cord compression occurs.
References
- World Health Organization: ICD-10 International Statistical Classification of Diseases, 10th Revision – Code M43.5, Other specified deforming dorsopathies.
- 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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