Embolization Treatment of Chronic Refractory Shoulder Tendinopathy (ELECTRC)

Inclusion Criteria: Male, female, transgender female, transgender male, non-binary Moderate to severe shoulder pain (VAS > 40) Pain refractory to at least 6 months of physician-directed conservative therapy (analgesics or injections or PT), including a minimum of 6 weeks of PT Willing, able, and mentally competent to provide informed consent and to tolerate angiography and physical therapy Exclusion Criteria: History of peripheral arterial disease or peripheral artery disease symptoms including claudication, diminished or absent upper/lower extremity pulses, or known upper extremity arterial atherosclerosis or occlusion that would limit selective angiography Known history of anaphylaxis to iodinated contrast agents or gadolinium based contrast Acute kidney injury Allergy to poppy seeds or lipiodol Renal dysfunction as defined by serum creatinine >1.6 dl/mg or eGFR <60 obtained within 30 days of procedure. Uncorrectable coagulopathy (platelet count < 50,000, international normalized ratio >1.8 within 30 days of procedure Active systemic or local upper extremity infection Patient pregnant, intending to become pregnant during the study. Prior shoulder replacement surgery Prior rotator cuff repair surgery Previous history of complete full-thickness tear of the rotator cuff Presence of non-MRI compatible devices (e.g., non-compatible cardiac pacemaker).