Comparison of DISCOVER™ Artificial Cervical Disc and ACDF for Treatment of Cervical DDD (IDE Study)

This study is designed as a multicenter, prospective, randomized, controlled trial. Subjects
will be stratified by the number of levels to be treated then assigned treatment in a
randomized 1:1 ratio. Participants in the treatment group will undergo cervical total disc
replacement with the DISCOVER Artificial Cervical Disc. Participants in the control group
will undergo anterior cervical discectomy and fusion with the SLIM-LOC™ Anterior Cervical
Plate System with a cortical or cortico-cancellous allograft spacer. Follow-up visits will
occur at 2 weeks, 3 and 6 months and 1, and 2 years for all randomized subjects. Subjects
that received the control treatment will complete their required study participation at 2
years post operative and subjects assigned the Discover treatment will complete their
participation at 5 years post operative. Follow-up for the Discover treatment group will be
via a telephone administered questionnaire at 3, 4 and 5 years post operative.

Key Inclusion Criteria:

- Objective evidence of cervical disc disease in 1 vertebral level between C3-C7 defined
as (a) shoulder and/or arm pain in a documented radicular distribution resulting from
herniated disc or bony osteophytes or (b)myeloradiculopathy resulting from mild spinal
cord compression and nerve root impingement

- Unresponsiveness to documented non-surgical management for greater than or equal to 6
weeks and/or presentation with progressive symptoms of nerve root or spinal cord
compression in the face of continued non-surgical management

- Moderate Neck Disability Index (NDI) score

- Able to give informed consent for study participation

- Able and willing to return for all follow-up visits

Key Exclusion Criteria:

- Significant cervical degenerative disc disease

- Prior fusion procedure at any level(s) (C1-T1)

- Marked cervical instability on lateral or flexion/extension radiographs

- Presence of systemic infection or infection at the surgical site

- Diagnosis of a condition, or requires postoperative medication(s), which may interfere
with bony/soft tissue healing

- History of alcohol and/or drug abuse

- Any known allergy to a metal alloy or polyethylene

- Morbid obesity

- Any significant general illness (e.g., metastatic cancer, HIV)