[Echography, magnetic resonance and double-contrast arthrography of the rotator cuff. A prospective study in 30 patients].

Shoulder pain is a common clinical problem with different etiologies. Without a specific diagnosis, treatment could be ineffective, causing functional limitation, chronic pain and atrophy. US and MRI allow in many cases to correctly define the different etiologies causing shoulder pain, often due to rotator cuff conditions. From June to September 1992, thirty patients with clinically suspected acute or chronic rotator cuff lesion were studied with US, MRI and double contrast arthrography. US and MRI findings were evaluated and compared using arthrography and surgery as the gold standard. The overall accuracy of MRI was 93%: the method yielded accurate information about size and number of rotator cuff tears, and about bursal, bone and muscle involvement. US accuracy was 83% in the diagnosis of large tears, 63% in the diagnosis of small and partial tears and only 11% in the diagnosis of tendinitis. Both MRI and arthrography exhibited high accuracy (respectively 91 and 100%) in the detection of rotator cuff tears when their results were compared with surgical findings. A flow chart to be used in the patients with acute or chronic shoulder pain was drawn from the critical analysis of the above results.