RecruitingDevice studyEvaluation of Safety and Effectiveness of Primary Hybrid Construct of Mobi-C and ACDF in the Treatment of Two-level Symptomatic Degenerative Disc Disease in the Cervical Spine.The study is a prospective, multi-center cohort study of patients with two-level DDD implanted with CDA adjacent to ACDF (hybrid construct). The overall success of the hybrid procedure will be compared to 2-level ACDF historical controls from the Mobi-C IDE trial. 97 patients will receive the hybrid surgery and will be followed for a minimum of 2 years.