Last Updated: December 28, 2016. For intra-articular injection autologous platelet-rich plasma and local anesthetic/corticosteroid are effective, easy, and safe in the treatment of lumbar facet joint syndrome, according to a study published online Dec. 18 in Pain Practice. WEDNESDAY, Dec. 28, 2016 (HealthDay News) — For intra-articular injection autologous platelet-rich plasma (PRP) and local anesthetic...