Prospective Study of Safety and Efficacy of InQu® Bone Graft Extender in Lumbar Interbody Fusion Surgery

Inclusion Criteria: * A subject may be included if s/he meets the following criteria: 1. ≥18 years of age; 2. Able to give appropriate informed consent; 3. Willing and able to meet the proposed follow-up schedule; 4. Has documented diagnosis of up to, and including, Grade 1 spondylolisthesis and/or degenerative disc disease; 5. Has given appropriate consent for, and undergoes, standard-of-care transforminal or posterior lumber interbody fusion; 6. Use of InQu Bone Graft Extender on-label. Exclusion Criteria: 1. Any prior lumbar fusion surgery; 2. Requires fusion surgery of more than two adjacent levels; 3. Has fusion surgery requiring titanium cages; 4. Has a systemic infection or has infection at the site of surgery; 5. Has a medical condition or requires post-operative medication that, in the opinion of the investigator, may interfere with bony/soft tissue healing; 6. Has any physical, social, psychological or economic condition that, in the opinion of the investigator, may preclude accurate data collection or evaluation.