Introduction Shoulder impingement syndrome (SIS) is the mechanical entrapment of the supraspinatus tendon underneath the acromial arch of scapula. The narrowing of the subacromial space (SAS) was ...

The aim of this study was to compare histological muscle changes in partial-thickness to full-thickness tears of the supraspinatus tendon. Methods Muscle biopsies of nine partially torn and 15 fully ...