Prospective Clinical Study to Evaluate the Efficacy of the Stand-alone Cervical Interbody Cage C-CURVE ( Titanium) Manufactured by MEDICREA®

Inclusion Criteria: * Patient operated with C-CURVE TITANIUM (MEDICREA) for one or several levels (3 maximum) * Cage implanted with the bone graft "OSMOSYS" (MEDICREA) or an auto bone graft from patients * Patient ≥ 18 years * Patient affiliated to health care insurance (social security in France) * Patient who signed an informed consent form * Patient able and willing to complete a self-administered questionnaire * Patient able to understand protocol and the planning visit and willing to perform all of them * Patient with a pathology indicated in the instruction for use of the implant Exclusion Criteria: * Patient with no preoperative data available (X-rays, questionnaires) * Hybrid installation or cervical additional fixation * Patient contraindicated for X-ray(s) and/or CT-Scan(s) * Patient with contraindications indicated in the instruction for use of the implant * Patient judged as non-compliant by the investigator, not unable to come back for the follow-up visits (for example: patient living more than 100 km away). * Patient who declined to participate to the study or unable to give his consent Vulnerable population as explained in the protocol