Post-Market Study Evaluating the Safety and Effectiveness of NuNec® Cervical Arthroplasty System

Inclusion Criteria: * is at least 21 years of age and skeletally mature * must have symptomatic degenerative disc disease at one level in the cervical spine, C3 to C7, demonstrated by herniated disc and/or spondylosis; * must have completed a minimum of six weeks of unsuccessful conservative, non-operative care or has the presence of progressive symptoms or signs of nerve root/spinal cord compression in the face of conservative treatment * must score at least 15/50 (30%) on the Neck Disability Index * is willing and able to follow the post-operative management program * must understand and sign the informed consent document Exclusion Criteria: * symptomatic cervical DDD at more than one level * axial neck pain as the primary diagnosis without evidence of neural compression * neck or arm pain of unknown etiology * any significant anatomical consideration which would make the anterior cervical approach excessively risky or impossible * severe spondylosis at the target level * prior surgery at the target level * fused level adjacent to the target level * osteoporosis, osteopenia, osteomalacia, Paget's disease or metabolic bone disease * active infection or surgical site infection * is using any medication known to interfere with bone/soft tissue healing * diabetes mellitus requiring daily insulin management * any terminal, systemic, or autoimmune disease * medical conditions or mental incompetence which may interfere with study requirements * BMI \>40 or a weight more than 100 lbs over ideal body weight * chemical dependency problem that may interfere with study requirements * current smokers * history of any invasive malignancy unless treated and in remission for at least two years * documented allergies to metal or plastic * currently pregnant, or interested in becoming pregnant during the study follow-up