Which of the following region of spine is most commonly affected in rheumatoid ahritis?
Rheumatoid ahritis principally involves atlantoaxial joint of cervical spine. Atlantoaxial involvement of the cervical spine result in compressive myelopathy and neurologic dysfunction. Rheumatoid ahritis does not affect thoracic and lumbar spine except in unusual circumstances. Reference: Harrison's Principles of Internal Medicine 18e chapter 321.
Cervical spine
Thoracic spine
Lumbar spine
Sacral spine