[Expert testimony on rotator cuff rupture].

In giving an expert opinion, it is difficult to differentiate between the two possible causes of damage of the rotator cup, degeneration and trauma. After description of the anatomical problems, different causes for degenerative changes, especially of the supraspinatus tendon, are discussed. Various possibilities of accidents are analysed if they can cause damage of the rotator cup. The special conditions of the private accident insurance are discussed.