In rheumatoid arthritis, the most common type of cervical spine subluxation is:

• A Lateral atlantoaxial subluxation
• B Posterior atlantoaxial subluxation
• C Vertical subluxation of the odontoid
• D Anterior atlantoaxial subluxation ✓

Explanation

Anterior atlantoaxial subluxation is the most common cervical spine abnormality in rheumatoid arthritis, occurring in up to 30% of patients. It results from erosion of the transverse ligament and laxity of the atlantoaxial joint. Posterior atlantoaxial subluxation is rare and usually requires a fractured or eroded odontoid. Vertical subluxation (cranial settling) and lateral subluxation are less common. Anterior subluxation is assessed by measuring the atlantodental interval on lateral flexion radiographs.

Reference: Apley's System of Orthopaedics and Fractures, 10th ed.

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Written and medically reviewed by the StethoPrep medical team.