Please assess the completion status of the following clinical trial:

Trial Title: Advent™ Cervical Disc Versus ACDF for Treatment of One Level Degenerative Disc Disease (IDE Study)

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: SINGLE
- Phase: None
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* One cervical spine level between C3 and C7 which requires surgical treatment for intractable cervical radiculopathy and/or myelopathy demonstrated by herniated disc, and/or osteophyte formation leading to nerve root and/or spinal cord compression confirmed by patient history (e.g. neck and/or arm pain), functional and/or neurological deficit (e.g. numbness, weakness, diminished or pathologic reflexes, gait disturbances, etc.) and radiographic studies (e.g. CT, MRI, x-rays, etc.).~* Unresponsive to conservative care over a period of at least 6 weeks~* Neck Disability Index score ≥ 15/50 (30%)~* Willing and able to comply with the requirements of the protocol including follow-up requirements and to sign a study specific informed consent~Exclusion Criteria:~* More than 1 level requiring surgical treatment for intractable cervical radiculopathy and/or myelopathy.~* Active local (at the proposed surgical site) or systemic infection~* Prior anterior neck surgery at any level.~* Prior posterior cervical spine surgery at the index level except posterior decompressive surgery where the posterior elements are preserved.~* Currently undergoing treatment for disease of the thoracic or lumbar spine.~* Axial neck pain as the primary diagnosis, without evidence of neural compression~* Significant cervical anatomical deformity~* Any anatomical consideration which in the investigators opinion would make the anterior cervical approach excessively risky or impossible~* Severe obesity defined as a Body Mass Index (BMI) \> 40~* Instability on AP, lateral neutral or flex/ext images: ≥2mm translation relative to the adjacent segment, and/or ≥ 11 degrees relative to adjacent segments~* Central disc height ≤ 2mm~* Advanced spondylosis (i.e. facet joints degeneration, anterior or posterior bridging of the interspace or lack of motion on the pre-operative flexion/extension x-rays)~* Severe cervical myelopathy as indicated by: Signs and/or symptoms \> 6months duration, Nurick's Classification grades IV or V, and/or Myelomalacia as evidence on a MRI~* Metabolic bone disease such as osteoporosis to a degree that spinal instrumentation is contra-indicated (Males over 55 years of age, females over 50 years of age and/or subjects that in the investigators opinion are medical indicative of osteoporosis (e.g. early menopause, steroid use, etc.) are required to have a DEXA scan; If the DEXA scan is ≤ -2.5t in the spine, the patient must be excluded)~* Allergy to any component of the device (titanium, polycarbonated polyurethane, polyethylene terephthalate, or ethylene oxide residuals)~* Chronic steroid or other medication use that may interfere with bony/soft tissue healing~* History of endocrine or metabolic disorders (e.g. Paget's disease) known to effect bone and mineral metabolism~* Autoimmune diseases e.g., ankylosing spondylitis, rheumatoid arthritis, etc.~* Insulin dependent diabetes mellitus~* Active malignancy~* Currently pregnant or considering becoming pregnant during the follow-up period~* Advanced emphysema, Alzheimer's disease or other medical conditions that would interfere with patient self-assessment of function, pain or quality of life~* Medical condition (e.g. unstable cardiac disease, end-stage cancer) that may result in patient death prior to study completion~* Chemical dependency (e.g. alcohol or narcotic addiction) problem that may interfere with study requirements~* Mental incompetence as determined by the Investigator which may effect participation in the study~* Incarcerated~* Involved in any current or pending litigation relating to a spinal condition~* Concurrently participating in any other investigational study~* Anatomy (e.g. endplate dimensions) at the index level not consistent with the dimensions of the implants available (e.g. based on pre-operative radiographic evaluations and templates in the surgical technique manual).

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: None
- Healthy Volunteers: f

Study Arms:
- Advent™ Cervical Disc (Type: EXPERIMENTAL): Cervical artificial disc replacement: Advent™ Cervical Disc
- Standard care - Control (Type: ACTIVE_COMPARATOR): Anterior cervical discectomy and fusion (ACDF) with Hallmark™ Anterior Cervical Plate System

Based on this trial design, predict the completion outcome and termination type (if applicable).

Answer: outcome: terminate
termination_type: feasibility