More than 125 shoulders have been studied by injecting water-soluble radioopaque dye into the joint cavity. Arthrographic demonstrations have paralleled clinical findings and have been confirmed surgically in all those patients who came to operation. The method has been found to be simple to perform, and has supplied useful information in rotator cuff tears, soft-tissue lesions associated with shoulder dislocations, tears of long head of biceps, transverse bicipital ligament tears, and frozen shoulders. No infections have resulted from arthrographic injections performed according to the technique here described. The method supplies a permanent record of the various soft tissue lesions, not demonstrable in plain films of the shoulder.