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This article assesses the therapeutic efficacy of ionizing radiation for the treatment of shoulder tendonitis/bursitis in the USA over the period of its use (human 1936–1961; veterinary 1954–1974). Results from ~3,500 human cases were reported in the clinical case studies over 30 articles, and indicated a high treatment efficacy (>90 %) for patients. Radiotherapy was effective with a single treatment. The duration of treatment effectiveness was prolonged, usually lasting until the duration of the follow-up period (i.e., 1–5 years). Therapeutic effectiveness was reduced for conditions characterized as chronic. Similar findings were reported with race horses in the veterinary literature. These historical findings are consistent with clinical studies over the past several decades in Germany, which have used more rigorous study designs and a broader range of clinical evaluation parameters. Radiotherapy treatment was …