Effectiveness of Corticosteroid vs Ketorolac Shoulder Injections

Inclusion Criteria: * Age: \> or = 18 years old * Rotator Cuff Tendinitis * Atraumatic Full-thickness Rotator Cuff Tear * Subjects who speak English * Women who are of non-childbearing potential Exclusion Criteria: * Age: \< 18 years old * Prior Shoulder Surgery * Fracture * Acute Traumatic Rotator Cuff Tear * Infection * Uncontrolled Diabetes Mellitus (HbA1c \>8) * Uncontrolled High Blood Pressure (Hypertension) * Recent Prior Shoulder Injection in either the Subacromial space Workers Compensation * History of Peptic Ulcer disease (includes both Gastric and Duodenal Ulcers), Gastrointestinal perforation, Inflammatory Bowel disease (Ulcerative Colitis, Crohn's disease), or any other gastrointestinal pathology * Tumor Involving the Shoulder Region * Prior history of gastrointestinal bleeding, allergic reactions, impaired renal function, seizures or cardiac arrhythmias * Subject unable to provide informed consent * Subjects who don't speak English * Patients who are pregnant or lactating at time of screening or are of pregnant bearing age * Patients currently receiving an aspirin, NSAID regimen or any other anti-inflammatory agents that could affect inflammation response. * Patients taking any anti-platelet agents, warfarin or other anticoagulants, or SSRIs. * Patients with any bleeding disorders such as coagulopathy, hypercoagulable state, or platelet disorders including thrombocytopenia. * Patients with cardiac disease such as congestive heart failure, coronary artery disease, or myocardial infarction. * Patients with severe renal failure. Patients with severe liver impairment or active liver disease. * Patients with heavy alcohol use; this is defined as consuming 8 or more drinks per week for a woman and 15 or more drinks per week for a man. * Patients likely to have severe problems maintaining follow-up, including patients diagnosed with severe psychiatric conditions, patients who live too far outside the hospital's catchment area, patients who are incarcerated and patients who have unstable housing situations. Patients with a known hypersensitivity to bupivacaine or other local anesthetic agent of the amide-type. * Patients who have experienced asthma, urticaria, or allergic-type reactions after taking aspirin or other NSAIDs * Patients who are allergic to aspirin, ketorolac tromethamine and other NSAIDs. * Patients who are currently on probenecid or pentoxifylline as described in the approved label of Ketorolac tromethamine injection.