Fibrin for Chronic Multi-level Discogenic Low Back Pain

Inclusion Criteria: * Recipient of Intra-annular fibrin injection for annular defects identified radographically and by annulogram Exclusion Criteria: * Scoliosis greater than 20 degrees * Spondylolysis * Spondylolisthesis greater than Grade 1 * Disc extrusion * Disc herniations or bulges \> 4mm causing severe stenosis * Prior lumbar surgery or intradiscal procedure (i.e. intradiscal electrothermal therapy, nucleoplasty) * Cauda equina syndrome * Active malignancy or tumor as source of symptoms * Evidence of prior lumbar vertebral body fracture or trauma * Foraminal stenosis at the affected levels resulting in severe thecal sac compression * Dynamic instability on lumbar flexion/extension radiographs * Positive response to diagnostic medial branch block or facet joint injection or sacroiliac joint injection * Known bleeding disorder * Known or suspected hypersensitivity or allergy to drugs or components of the fibrin sealant, including aprotinin, used in the procedure * Presence of ferromagnetic implants that would interfere with MRI evaluations * Active or pending workers' compensation claims or other litigation related to the condition. * Pregnant or plans to become pregnant over the course of study participation (2 years)