[The rotator cuff syndrome--a frequent disease caused by loading]

The rotator cuff syndrome is defined as a cronical pain syndrome, originating from the rotator cuff with characteristic pain and referred pain. Disorders evolving from the rotator cuff and the rotator muscles comprise between 70 og 90% of the shoulder disorders. The rotator cuff syndrome may be of occupational origin, particularly in heavy work with tasks at or above shoulder level, e.g. shipyard welders and plate workers. Biomecanically surveys show that continuous blood flow in the rotator muscles ceases at about 30 degrees of flexion or abduction of the upper arm. Electromyographic examinations have shown high muscle tension in the same muscles in assembly plant employees. High prevalences of shoulder pain have been shown in these groups and it is considered that the workers are actually suffering from disorders in the rotator cuff and its muscles. The rotator cuff syndrome is on the list of occupational disorders in the Danish Workers' Compensation Act but, in the authors' experience knowledge on etiology, examination and treatment is insufficient. Diagnostic criteria are proposed with the object of improving clinical practice and medical insurance declarations.