CONDUIT vs. PEEK Cages

Inclusion Criteria: * • Patients with one to two consecutive level lumbar degenerative disease from L2to S1, including Grade 1 (\<25%) Spondylolisthesis * Patients undergoing direct lateral interbody fusion (transpsoas or anterior-to-psoas approach) for lumbar disease * Skeletally mature patients, aged 18 and older * Patients able to fully comply with the clinical protocol and adhere to the follow-up schedule and protocol requirements * Patients able to understand and sign the study-specific, IRB approved informed consent form Exclusion Criteria: * • Spondylolisthesis greater than Grade 1 * Traumatic lumbar disease * Spinal Deformity * Coronal Cobb angle greater than 40 degrees * Severe sagittal imbalance * Existing fusion construct longer than 2 consecutive levels * Active infection - systemic or local * Tumor diagnosis * Untreated osteoporosis, defined as T Spine \< -2.5 on DEXA scan * Active smoking habit * Current incarceration * Pregnancy * Involvement in an active spinal litigation