Clinical and Radiological Outcomes of Posterior Cervical Fusion Supplemented With Interfacet Spacers

Inclusion Criteria:

* ≥ 18 years old
* Symptomatic multi-level degenerative spondylosis necessitating posterior cervical arthrodesis in the subaxial cervicothoracic spine (between C2-upper thoracic).
* Surgery performed within the Department of Neurological Surgery at The Ohio State University Wexner Medical Center (OSUWMC)

Exclusion Criteria:

* Traumatic injury
* Co-morbidity requiring medication use that may interfere with bone or soft tissue healing (i.e., high dose oral or parenteral glucocorticoids, immunosuppressive agents, methotrexate) - at discretion of investigator
* Severe co-morbidities (e.g., heart, respiratory, or renal disease)
* Recent (\<3 yrs) or co-incident spinal tumor or infection
* Concurrent involvement in another investigational drug or device study that could confound study data
* History of substance abuse (recreational drugs, prescription drugs or alcohol) that could interfere with protocol assessments and/or with the subject's ability to complete the protocol required follow-up
* Subjects who are pregnant or plan to become pregnant in the next 24 months
* Prisoner