Inclusion Criteria:  Skeletally mature adults ages 35 - 80 years of age, inclusive Diagnosis of lumbar degenerative disc disease with or without neurologic deficit and associated central and/or unilateral/bilateral foraminal stenosis Subject undergoing one or two level transforaminal lumbar interbody fusion Able to read and understand all documents used in this study , including the informed consent and patient-reported outcome questionnaires  Exclusion Criteria:  Patients over 80 years of age Patients under 35 years of age Current smokers BMI>42 Subject has spondylolisthesis > 2 Subjects with multilevel >2 levels of symptomatic disease Subjects with significant spinal deformity Subject is pregnant, plans to become pregnant or is breast feeding