Study of the Safety and Effectiveness of the Artificial Cervical Disc - Low Profile Device at Two Adjacent Levels

Inclusion Criteria: * Has cervical DDD at 2 adjacent cervical levels (C3-C7) requiring surgical treatment \& involving intractable radiculopathy, myelopathy, or both * Has a herniated disc and/or osteophyte formation at each level to be treated that is producing symptomatic nerve root and/or spinal cord compression. The condition is documented by patient history, and the requirement for surgical treatment is evidenced by radiographic studies * Unresponsive to non-operative treatment for approximately 6 weeks or has the presence of progressive symptoms or signs of nerve root/spinal cord compression in the face of continued non-operative management * Has no previous surgical intervention at the involved levels or any subsequent planned/staged surgical procedure at the involved or adjacent level(s) * Must be ≥ 18 years; skeletally mature at time of surgery * Preoperative NDI score ≥ 30 * Preoperative neck pain score ≥ 8 based on the preoperative Neck and Arm Pain Questionnaire * If a female of childbearing potential, patient is non-pregnant, non-nursing, and agrees not to become pregnant during the study period * Is willing to comply with the study plan and sign Patient Informed Consent Form Exclusion Criteria: * Has a cervical spinal condition other than symptomatic cervical DDD requiring surgical treatment at the involved levels * Has documented or diagnosed cervical instability relative to adjacent segments at either level, defined by dynamic (flexion/extension) radiograph…