M6-C Artificial Cervical Disc Two-Level IDE Pivotal Study

Running, not enrolling · Not applicable

Conditions studied: Cervical Disc Degenerative Disorder

In brief

Prospective, concurrently controlled, multi-center study to evaluate the safety and effectiveness of the Spinal Kinetics M6-C™ artificial cervical disc compared to anterior cervical discectomy and fusion (ACDF) for the treatment of contiguous two-level symptomatic cervical radiculopathy at vertebral levels from C3 to C7 with or without spinal cord compression.

Key facts

Study ID

NCT04982835

Run by

Orthofix Inc.

People needed

156

Starts

2021-07-26

Expected to finish

2026-12-01

Last updated by the study team

2025-11-14

Who can join

Age: 18 and older, up to 75. Sex: any. Healthy volunteers: not accepted.

You may qualify if…

• Diagnosis of degenerative cervical radiculopathy with or without spinal cord compression requiring surgical treatment at two contiguous levels from C3 to C7 demonstrated by signs and/or symptoms of disc herniation and/or osteophyte formation (e.g. neck and/or arm pain, radiculopathy, etc.) and is confirmed by patient history and radiographic studies (e.g. MRI, CT, x-rays, etc.)
• Inadequate response to conservative medical care over a period of at least 6 weeks or have the presence of progressive symptoms or signs of nerve root/spinal cord compression in the face of continued non-operative management
• Neck Disability Index score of ≥ 30% (raw score of ≥ 15/50)
• Neck or arm pain Visual Analog Scale Score ≥ 4 on a scale of 0 to 10
• Willing and able to comply with the requirements of the protocol including follow-up requirements
• Willing and able to sign a study specific informed consent
• Skeletally mature and at least 18 years old but not older than 75 years old

You may not qualify if…

• More than two cervical levels requiring surgery, or two non-contiguous levels requiring surgery
• Previous anterior cervical spine surgery
• Axial neck pain as the solitary symptom
• Previous posterior cervical spine surgery (such as a posterior element decompression) that destabilizes the cervical spine
• Advanced cervical anatomical deformity (such as ankylosing spondylitis, scoliosis) at either of the operative levels or adjacent levels
• Symptomatic facet arthrosis
• Less than four degrees of motion in flexion/extension at either of the index levels
• Instability as evidenced by subluxation greater than 3 millimeters at either of the index or adjacent levels as indicated on flexion/extension x-rays.
• Advanced degenerative changes (e.g., spondylosis) at either of the index vertebral levels as evidenced by bridging osteophytes, central disc height less than 4 millimeters and/or < 50% of the adjacent normal intervertebral disc, or kyphotic deformity > 11 degrees on neutral x-rays
• Severe cervical myelopathy (i.e., Nurick's Classification greater than 2)
• Active systemic infection or infection at the operative site
• Co-morbid medical conditions of the spine or upper extremities that may affect the cervical spine neurological and/or pain assessment
• Metabolic bone disease such as osteoporosis that contradicts spinal surgery
• History of an osteoporotic fracture of the spine, hip or wrist
• History of an endocrine or metabolic disorder (e.g. Paget's disease) known to affect bone and mineral metabolism
• Taking medications that may interfere with bony/soft tissue healing including chronic steroid use
• Known allergy to titanium, stainless steels, polyurethane, polyethylene, or ethylene oxide residuals
• Fibromyalgia, Rheumatoid Arthritis (or other autoimmune disease), or a systemic disorder such as HIV or acute hepatitis B or C.
• Insulin dependent diabetes
• Medical condition (e.g., unstable cardiac disease, cancer) that may result in patient death or have an effect on outcomes prior to study completion
• Pregnant, or intend to become pregnant, during the course of the study
• Severe obesity (Body Mass Index greater than 45)
• Physical or mental condition (e.g. psychiatric disorder, senile dementia, Alzheimer's disease, alcohol or drug addiction) that would interfere with patient self-assessment of function, pain or quality of life.
• Involved in current or pending spinal litigation where permanent disability benefits are being sought.
• Incarcerated at time of study enrollment

Where it is running

• Desert Institute for Spine Care — Phoenix, Arizona, United States
• Beverly Hills Spine Surgery — Beverly Hills, California, United States
• Memorial Orthopaedic Surgical Group — Long Beach, California, United States
• Disc Sports & Spine Center — Newport Beach, California, United States
• UC Irvine Medical Center — Orange, California, United States
• Institute of Neuro Innovation — Santa Monica, California, United States
• St. Charles Spine Institute — Thousand Oaks, California, United States
• University of Colorado School of Medicine - Department of Orthopedics — Aurora, Colorado, United States
• Steadman Philipon Research Institute — Vail, Colorado, United States
• Orlando Health — Orlando, Florida, United States
• Joseph Spine Institute — Tampa, Florida, United States
• Longstreet Clinic — Gainesville, Georgia, United States
• Axis Spine — Coeur d'Alene, Idaho, United States
• Carle Health — Urbana, Illinois, United States
• Brigham & Women's Hospital — Boston, Massachusetts, United States
• Michigan Orthopedic Surgeons — Southfield, Michigan, United States
• The Orthopedic Center of St. Louis — St Louis, Missouri, United States
• Metropolitan Neurosurgery Associates - Englewood Health — Englewood, New Jersey, United States
• Mayfield Clinic — Cincinnati, Ohio, United States
• St. David's Healthcare — Austin, Texas, United States
• American Neurospine Institute/Medical City Frisco — Frisco, Texas, United States

Full record on ClinicalTrials.gov

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