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Fig. 4 | Journal of Orthopaedic Surgery and Research

Fig. 4

From: Analysis of surgical strategies and efficacy in the treatment of Os odontoideum with atlantoaxial dislocation

Fig. 4

A male patient was admitted for numbness and weakness of limbs for 7 months and rheumatoid arthritis for 5 years. Hyperextension and hyperflexation X-ray presented AAD, and ADI were almost unchanged in dynamic position (a, b). CT showed OO (c, black arrow) and bony fusion between the atlantoaxial joints (d, red arrow), so it was classified as type IV. MRI showed compression of the cervicomedullary junction (CMJ) (e), followed by transoral release (f) and resection of bony fusion tissue. Finally, posterior fixation and fusion were accomplished, and postoperative imaging data showed effective reduction, fixation, and fusion (g)

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