NACD vs ESWT for calcifying tendinitis

INTERVENTION: Patients will be randomized to receive NACD or ESWT treatment. NACD treatment: a sonographically guided removal of the calcific deposits will be performed. ESWT treatment: patients will receive a focused ESWT. Both will be conducted according to a standardized protocol CONDITION: Tendinitis calcarea, Shoulder disorders , Tendinitis ; ; PRIMARY OUTCOME: Between group difference in recovery of functional outcome score of the CMS between baseline and 12 months follow‐up SECONDARY OUTCOME: Between group differences in change in pain scores, quality of life, adverse events and use of medications. Also cost‐effectiveness will be analyzed to be able to analyze this parts of the iPCQ and ProDisq must be completed. Furthermore, the ‘Diagnose & Behandel Combinatie (DBC)’ will be examined two find a difference in the procedural costs of the two treatment modalities INCLUSION CRITERIA: ‐ age: >18 years ‐ chronic shoulder complaints (> 6 months) ‐ calcifications on conventional x‐rays O type I en II calcifications according to the Gärtner classification O minimal diameter of calcification of 10 mm on AP view ‐ able and willing to comply to study protocol