Retrospective Study With Patients Treated With STALIF® C or M and Ti or FLX Implants for 1 and 2 Levels

This is a Retrospective, Observational Multi-Center study, utilizing patients diagnosed with up to a Grade1 spondylolisthesis or retrolisthesis or symptomatic degenerative disc disease and treated with STALIF® C, or M, Ti and/or FLX implants at one or two levels.

Inclusion Criteria:Diagnosed with up to a Grade1 spondylolisthesis or retrolisthesis or degenerative disc disease of the cervical or lumbar spine at time of surgery.2 levels, between:C: C2-T1 (neck)M: L2-S1 (low back)Skeletally mature at the time of surgery with clinical and radiological evidence of degenerative disc disease of the cervical or lumbar spine.Exclusion Criteria:Subject who had surgery with the STALIF devices at more than 2-levels.In the Investigator's opinion, the subject diagnosed with a disease or condition, which precludes the possibility of healing at the time of surgery