Comparison of Artificial Disc Implants in Cervical Disc Arthroplasty

This study compares two different artificial disc implants used in cervical disc arthroplasty — a surgery that replaces a damaged disc in the neck with an artificial one. The goal of the surgery is to relieve arm or neck pain caused by a compressed nerve or spinal cord, while preserving natural neck movement. The study aims to determine which implant design leads to better outcomes in terms of pain relief, neck function, and complication rates. You may be eligible if: - You are between 18 and 60 years old - You have cervical spondylotic myelopathy and/or radiculopathy (arm or hand pain/weakness) at a single level between C3 and C7, caused by disc herniation or degenerative disc disease - Your symptoms have not improved after at least 6 weeks of non-surgical treatment - You have decided to undergo cervical disc arthroplasty - You have signed an informed consent form You may NOT be eligible if: - You have had prior cervical spine surgery - You need surgery at more than two disc levels - You have a known allergy to metal alloys or polyethylene - You are morbidly obese - You have an active local or systemic infection - You have a psychiatric disorder, chronic alcohol or substance abuse, or another condition that would prevent you from completing follow-up Talk to your doctor to see if this trial is right for you.