Offset Mechanisms in Evaluation of Lumbar Medial Branch Blocks

Inclusion Criteria: * Scheduled for lumbar MBB in UPMC Pain Management clinics * Age \> 18 years old * Predominantly axial chronic low back pain at least 3 months on a daily basis * Must meet the minimum criteria for cognitive function using the PROMIS 2-item cognitive screener (\>3) * Low back pain intensity of \> 3/10 * Willing and able to receive study-related phone calls Exclusion Criteria: * History of spine surgery at the level of the lumbar MBB * Active worker's compensation or litigation claims * New pain and/or psychiatric treatments within 2 weeks of enrollment * Not fluent in English and/or not able to complete the questionnaires * Any clinically unstable systemic illness that is judged to interfere with the study