15 y/o football player presented after sustaining a knee injury during a game. Can you guess the lesion discovered as an incidental finding in this patient?

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Radiographs and MR image of 65YO woman with rheumatoid arthritis, posterior headaches, hand/gait clumsiness, dizziness. Diagnosis?

1-Rheumatoid plaque
2-Atlantoaxial subluxation
3-Basilar invagination
4-Subaxial subluxation

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Orthopaedic Knowledge Update® #OKU 14 Self-Assessment Exam now available! Get up to date on the latest research and treatments and confirm what you know with 200 multiple-choice questions across topics. Earn 20 #SAE credits toward #MOC . bit.ly/44Ism7f

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