plenty of people have joined in on this one so I'll not replicate the evidence that they have presented. I have several additional papers, but it is not changing the thrust of the responses - the evidence supports radial shockwave - and in fact, the evidence is STRONGER when there IS calcification as opposed to when there is a chronic tendinopaty around the shoulder without the calcification.
As for the issue(s) about renal calculi and other 'stories', I can not find any evidence in the research literature of this kind of untoward effect(s). The trial need to report adverse effects or events and none have identified this as a 'real' risk. Again, as has been mentioned, the RADIAL shockwave is not making the calcific deposit 'breakdown' - but it is stimulating a tissue recovery response (the focussed shockwave may well have some physical breakdown effects - but that is a different issue)