PMC7276610_01
(a and b) Axial computed tomography (CT) images from the time of presentation demonstrating atlantoaxial subluxation. (c) Axial CT image of C1-C2 overlap with rotatory subluxation measuring 45 . (d) Coronal CT image demonstrating rotation and subluxation of the left lateral mass of C1. (e) Open-mouth odontoid view from 4 months before presentation showing subluxation of atlas and axis demonstrated by asymmetry between C1-C2. (f) Open-mouth odontoid view status post 20lbs of cervical traction demonstrating reduction of atlantoaxial rotatory subluxation.
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F1
AARS of approximately 45  (Fig. 1). A cervical spine X-ray from 4 months prior was obtained that also demonstrated subluxation of the atlantoaxial joint (Fig. 1). Post-traction X-rays demonstrated reduction of the chronic subluxation (Fig. 1).
(a and b) Post-operative axial computed tomography (CT) images demonstrating instrumentation and interval reduction of atlantoaxial rotatory subluxation with restoration of alignment. (c) Post-operative coronal CT also demonstrating interval reduction of subluxation with in place hardware. (d) Post-operative open-mouth odontoid view demonstrating instrumentation and reduction of subluxation.
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F2
Post-operative CT and X-rays demonstrated maintained reduction and alignment of the atlantoaxial joint (Fig. 2).