It is mostly connected with an injury, and it is an acute, very painful state linking on the trauma with a loss of motility of the limb. Clinical problems are also present at small ruptures when the rupture goes through the capsule of the glenohumeral articulation, and at the same time it communicates with an articular cavity. The patient's affection is not dependent only on the level of the affection of the muscle, but on the reaction of the glenohumeral articulation.
The rupture of the rotator cuff is connected with:
At the ultrasound examination we most often meet a rupture of the rotator cuff than a rupture of the muscle before its coalescence into the rotator cuff. Therefore we cannot say which muscle is affected most frequently because it is not possible to differ the muscles in the rotator cuff. But it is true that the ruptures of the rotator cuff were most frequently localized laterally from a groove of the tendon of the long head of the biceps where the biggest part is attached to the m. supraspinatus. If these ruptures were localized medially from the groove of the tendon of the long head of the biceps, we diagnosed them as ruptures of the m. subscapularis. If we met a rupture of the rotator cuff in the area of the labrum posterior, it was thought to be a rupture of the m. infraspinatus. We think that the most frequent localization of the rupture of the rotator cuff is the area of the rotator cuff between the groove of the tendon of the long head of the biceps and labrum posterior, i.e. the rupture with a maximal affection of the m. supraspinatus.
picture of the m. supraspinatus