Inclusion Criteria:  - 40 years old or more; given the low prevalence of facet pain in younger adults LBP present for more than six months, with an axial predominance Persistent LBP after three months of non-interventional treatment Pretreatment ODI score of at least 30/100 (moderate disability associated with LBP) Pretreatment LBP VAS of at least 4/10 80% LBP reduction 30 minutes after 2 intra-articular diagnostic blocs with Xylocaine and Marcaine Radiological signs of facet joint degeneration (on X-rays, CT Scan or MRI) Absence of neurological deficit Sufficient knowledge of French or English to complete the questionnaires  Exclusion Criteria:  - Less than 40 years old Failure to achieve intra-articular diagnostic block Intra-articular injection of CS 3 months or less before recruitment Oral corticosteroid use in the last two weeks Inflammatory disease Systemic infection Infection at injection site Vertebral fracture Spine tumour Surgical intervention at injection site prior to the study or planned Cognitive disorder that impairs the ability to answer the questionnaires Pregnancy Breastfeeding Coagulopathy affecting platelets Drug affecting platelets that cannot be stopped (except acetylsalicylic acid) Intolerance or allergies to local anesthetics, contrast agent, CS, and blood products