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A hybrid case underwent anterior cervical discectomy and fusion at C3–C4 and cervical disc arthroplasty at levels C4–C5 and C5–C6. Panels (A,B) illustrate the lateral view of radiographs taken right after the operation and at a 1-year follow up, respectively. In Panel (B), there is an evident functional spinal unit height decrease > 5 mm at the C4–C5 and C5–C6 levels, accompanied by C5 vertebral collapse, resulting in Grade 3 subsidence in both segments (yellow arrow).
