Inclusion Criteria:  Known diabetic patients ages 40-75 undergoing clinically indicated standard of care corticosteroid glenohumeral joint injection Ability to perform daily blood glucose testing Can receive and send text messages  Exclusion Criteria:  Previous joint arthroplasty Corticosteroid injection at other sites in the body or in the shoulder within the past month Systemic corticosteroid within the last month other than asthma inhaler Anyone who are unable to read and/or understand English Pregnant women (self-report) Any clinical reason why any of the four medication options would not be safe or equally efficacious as the others