Prior to surgery in a patient with rheumatoid arthritis, which imaging study is recommended to assess for atlantoaxial subluxation?

Prior to surgery in a patient with rheumatoid arthritis, which imaging study is recommended to assess for atlantoaxial subluxation?

• A. MRI brain
• B. Chest X-ray
• C. Cervical CT or flexion/extension radiographs
• D. Lumbar CT

Answer: (C)

Rheumatoid arthritis can weaken the ligaments around the upper cervical spine, leading to instability at the atlantoaxial joint. Before surgery, it’s crucial to know if this subluxation is present because neck movement during intubation or positioning could injure the spinal cord. Imaging that directly assesses stability between the first two cervical vertebrae is the key. Flexion and extension views of the cervical spine (dynamic radiographs) reveal abnormal movement or translation between C1 and C2 that static images might miss. CT adds valuable detail by showing the bony anatomy of the atlas and axis, including any erosion or misalignment that contributes to instability. MRI can be helpful to evaluate soft tissues, pannus, and any cord compression, but it isn’t the primary test for detecting dynamic instability. The other options don’t assess the upper cervical stability relevant to atlantoaxial subluxation. So, cervical CT or flexion/extension radiographs are the best choices to screen for atlantoaxial subluxation before surgery.

Rheumatoid arthritis can weaken the ligaments around the upper cervical spine, leading to instability at the atlantoaxial joint. Before surgery, it’s crucial to know if this subluxation is present because neck movement during intubation or positioning could injure the spinal cord.

Imaging that directly assesses stability between the first two cervical vertebrae is the key. Flexion and extension views of the cervical spine (dynamic radiographs) reveal abnormal movement or translation between C1 and C2 that static images might miss. CT adds valuable detail by showing the bony anatomy of the atlas and axis, including any erosion or misalignment that contributes to instability.

MRI can be helpful to evaluate soft tissues, pannus, and any cord compression, but it isn’t the primary test for detecting dynamic instability. The other options don’t assess the upper cervical stability relevant to atlantoaxial subluxation.

So, cervical CT or flexion/extension radiographs are the best choices to screen for atlantoaxial subluxation before surgery.