Extracorporeal Shock-wave Therapy for Supraspinatus Calcifying Tendonitis: a Randomized Clinical Trial Comparing Two Different Energy Levels

Inclusion Criteria: * no visible clinical benefits by previous conservative treatment * medium and large calcific deposits, according to Bosworth classification * type I and II Gartner deposits Exclusion Criteria: * presence of tiny calcific deposits, according to Bosworth classification * type III, according to the Gartner classification * age (if less than 18 years old), diabetes, coagulation diseases or anticoagulant therapy, tumors, bone infections, previous shoulder surgery, pregnancy, pace-maker, acute bursitis demonstrated by ultrasound imaging, rheumatoid arthritis or other connective tissue diseases