[Value of exact focusing of extracorporeal shock waves (ESWT) in therapy of tendinitis calcarea. A prospective randomized study]

Abstract

A controlled randomized study was designed to analyse the effect of extracorporeal shockwave therapy (ESWT) focussed on either the calcified region or the insertion of the supraspinatus tendon. The study included 50 patients who were treated with a Storz Minilith SI-1 prototype shockwave generator. In the treated group, 4000 impulses (ED+ 0.78 ml/mm2) were applied, under local anaesthesia to the insertion of the supraspinatus in 2 treatment sessions. Control patients received ESWT focussed on the calcified region. Follow-up examinations were carried out 12 weeks after treatment by an independent observer. We found functional improvement and pain reduction in both groups. Statistical analyses showed significant superiority of ESWT focussed on the calcified region for the parameters constant-score (primary endpoint, p < 0.001) and pain intensity (p = 0.001). For the treatment of calcific tendinitis affecting the supraspinatus, we recommend accurate fluoroscopy-controlled focussing of ESWT on the calcification. Focussing on the calcification rather than on the insertion of the supraspinatus tendon is significantly more effective. On the basis of our results, ESWT requires the use of suitable shockwave generators that permit accurate focussing.