[Acromion resection for shoulder impingement syndrome. Results after an open and a percutaneous surgical method].

Anterior acromioplasty as described by Neer has been an effective procedure for shoulder impingement syndrome. Artroscopic acromioplasty is regarded as a technically demanding procedure. Since 1988 we have developed a closed percutaneous acromioplasty using motorized instruments. The purpose of this randomised clinical trial was to compare the results of open and closed percutaneous acromioplasty. We found a significant improvement in shoulder score, but no differences between the group treated with the open procedure and the group treated with the closed procedure.