Cervical Arthroplasty "Fixed Core" Versus "Movable Core": Clinical and Radiological Impact in the Medium Term

Inclusion Criteria: * Age \> 18 years * Symptomatic cervical disc degenerative pathologies to 1 or more contiguous or non-contiguous levels C3-4 to C6-7. * Symptoms including: Cervicobrachial neuralgia and / or Loss of root muscle strength and / or Sensory impairment and paresthesia and / or Cervical myelopathy table * Concordant diagnosis confirmed by CT (Computerized Tomography scanner) and MRI (Magnetic Resonance Imaging) of the cervical spine * NPDS (Neck Pain and Disability Scale) \> 30 * Failure to respond to conservative medical treatment for 6 weeks or worsening symptoms despite conservative treatment * Physical and mental fitness to ensure compliance with the protocol * Signed informed consent Exclusion Criteria: * Unstable cervical spine injuries requiring fusion C1 to C7 for whatever the etiology, proven on dynamic views of the cervical spine * Paget's disease, osteomalacia, other metabolic bone diseases * Chronic corticosteroid use * Active tumor pathology * Segmental angulation \< -11 ° or \> 11 ° at the respective segment or adjacent segments on static images of the cervical spine * Known allergy to Chromium, Cobalt, Mobdylene (chemical element), Polyethylene, or Titanium * History of surgery in the previous 30 days before inclusion * History of mental illness or disability involving a "safeguard procedure justice of the person" * Contraindications to non steroidal anti inflammatory