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Fig. 1 | Journal of Orthopaedic Surgery and Research

Fig. 1

From: Endoscopic transnasal anterior release and posterior reduction without odontoidectomy for irreducible atlantoaxial dislocation

Fig. 1

Case 6, 57-year-old female diagnosed with os odontoideum. a, b Flexion-extension radiographs showed no dynamic change of atlantodental interval (ADI) from flexion to extension. c Preoperative sagittal CT showing that the ADI is enlarged and the space available for the spinal cord (SAC) is decreased. d Sagittal MRI showed ventral compression of the spinal cord and a reduced CMA of 127.60°.

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Journal of Orthopaedic Surgery and Research

ISSN: 1749-799X