case_images: PMC7568111_01
case_images: X-ray cervical spine with flexion and extension views revealing of advanced cervical degenerative disc disease at C5-6 and C6-7 with congenital fusion of C7-T1.
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case_images: F1
case_images: Cervical dynamic X-rays showed a loss of the normal cervical lordosis with a congenital KFS fusion at the C7-T1 level; dynamic studies confirmed no instability at that level [Figure 1].
case_images: MRI cervical spine revealing of advanced cervical degenerative disc disease at C5-6 and C6-7 with congenital fusion of C7-T1.
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case_images: F2
case_images: In addition, the MR revealed bilateral, right greater than left, neuroforaminal stenosis at the C5-C6 and C6-C7 levels, without accompanying significant central stenosis [Figure 2].
case_images: CT cervical spine revealing of congenital fusion of C7-T1 vertebral bodies.
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case_images: The CT also confirmed the presence of the KFS congenital fusion at the C7-T1 level [Figure 3].
case_images: Final AP and lateral intraoperative fluoroscopic views confirming excellent placement of the cervical disc arthroplasty devices.
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case_images: In addition, the endplates at both levels were contoured and keels were cut to allow for implantation of the CDA devices [Table 1 and Figure 4].
case_images: POD#1 AP and lateral cervical radiographs confirming excellent placement of the cervical disc arthroplasty devices.
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case_images: F5
case_images: Formal upright vertical radiographs the next day, before discharge, confirmed adequate CDA positioning [Figure 5].
case_images: One-month postoperative AP and lateral cervical radiographs confirming excellent placement of the cervical disc arthroplasty devices and motion through flexion and extension.
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case_images: F6
case_images: At 8 postoperative months, her neurologic examination was normal, and radiographically, the CDA devices were adequately positioned [Figure 6].