1989 年 13 巻 1 号 p. 65-67
There are few reports on posterior lesions of the shoulder joint in baseball injuries, but anterior lesions of the joint are well known. In 1941, Bennett reported the exostosis in the posterior inferior region of the glenoid in groups of professional baseball pitchers. This lesion is the so-called Bennett's lesion. Then Lombardo reported four cases of posterior shoulder lesion in 1977. He said these patients had posterior capsule ossification and chronic inflammation of the capsule. After which Barnes reported on the posterior lesion problems in baseball players. Recently, we treated a baseball pitcher with this sort of lesion, by using a partial resection of the posterior labrum, arthroscopically. A twenty-year-old amateur baseball pitcher visited our clinic with a six-year history of the right shoulder pain. He could not throw a ball because of sharp pains and always had a dull pain for months. On physical-examination the posterior joint space was tender. Roentgenographically the exostosis in the posterior inferior region of the glenoid was present. Arthrographical examination revealed an hypertrophied posterior labrum. Partial resection of the posterior labrum was performed arthroscopically after conservative therapy had failed. Ten months after the operation, his shoulder was no longer sore in ADL, but he still had some pains when he threw a ball for a long time.