Inclusion Criteria:  Patient ≥18y.o. of age Primary glenohumeral arthritis (bone on bone or near bone on bone) that has been previously diagnosed on radiographs and clinical evaluation. Baseline pain level of VAS >4  Exclusion Criteria:  Secondary causes of arthritis (i.e. septic arthritis, rheumatoid arthritis, rotator cuff arthropathy, post-traumatic arthritis) Ipsilateral shoulder surgery within 1 year Any glenohumeral joint injection within 3 months Allergy to lidocaine Known pregnancy Workers compensation case regarding shoulder