Poster 484: A Multi‐Institutional Randomized, Double‐Blind, Placebo‐Controlled, Prospective Study of Intra‐Articular Lumbar Zygapophysial Joint Corticosteroid Injection(s) as Treatment of Chronic Low Back Pain in a Selected Population. Issue 9 (19th September 2017) - Fraiser, Ryan; Zheng, Patricia Z.; Schneider, Byron J.; Levin, Joshua; Huynh, Lisa; Smuck, Matthew; Ith, Agnes; Kennedy, David J.