Investigation of the Two Level Simplify® Cervical Artificial Disc

Inclusion Criteria: * Has cervical degenerative disc disease at two (2) adjacent cervical levels (from C3 C7) requiring surgical treatment and 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 (e.g., neck pain with arm pain, functional deficit and/or neurological deficit), and the requirement for surgical treatment is evidenced by radiographic studies (e.g., CT, MRI, x-rays, etc.); * Has been unresponsive to non-operative treatment for at least six 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 at least 18 years of age and be skeletally mature at the time of surgery; * Has a preoperative Neck Disability Index (NDI) ≥ 30; * Has a 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 the Patient Informed Consent Form. Exclusion Criteria: * Has a cervical spinal condition other than sympto…