The Japanese Orthopaedic Association (JOA) myelopathy score is a disease-specific and physician oriented system that mainly assesses the neurological status of the patient and enables surgeons to compare the changes in the neurological status of the patient before and after certain treatments. However, the JOA score does not include patients' satisfaction, disability, handicaps, or general health (physical and mental health), which can be affected by cervical myelopathy.

The Neck Disability Index (NDI) is designed to measure neck-specific disability. The questionnaire has 10 items to measure patient-reported disability secondary to neck pain and activities of daily living including personal care, lifting, reading, headaches, concentration, work status, driving, sleeping and recreation and patients rate their status from 0 (best) to 5 (worst imaginable). Individual item responses are summed to a total score, where 0 points indicate no activity limitations and 50 points indicate complete activity limitation.

After cervical stabilization fusion of the treated segment is aspired in most cases. The fusion status can be determined from radiographs (static or dynamic). Bony fusion can be characterized quantitatively by the fusion rate.

Occurrence of complications potentially associated with the implanted devices can never be fully excluded during spinal surgery. In order to monitor potential complication and to identify so far unknown complications Adverse Events and Serious Adverse Events deemed related to the investigational device are recorded.