J. S., a white boy, aged 17 years, examined, May 30, 1928, stated that in February, 1927, while he was in a hopping race at high school, hopping on the left foot with the right leg carried behind, he suddenly threw the right leg into hyperextension. This caused a sudden pain, which was so severe that he fell down. The buttock did not become swollen or discolored, but pain had persisted since the accident. The pain was of varying intensity and was aggravated chiefly by running. Sitting for any length of time (as at a movie) caused much pain, which required frequent shifting of position.
The right buttock seemed somewhat larger than the left. There was almost complete obliteration of the right gluteal fold. Deep palpation in the region of the tuberosity of the ischium revealed a hard movable mass. This mass had a considerable