The purpose of this study was to treat two cases of both fractures of the greater and the lesser tuberosity of the humerus. We reported on these two cases. Case 1-A 45-year-old woman had an epileptic fit by brain tumor on January 3,1998. The brain tumor was operated on at another hospital. She came to our hospital on February 16. The roentgenogram showed a 3-part fracture of the proximal humerus: severe displacement of both fractures of the greater and the lesser tuberosity, and the minimally displaced fracture of the anatomical neck of the humerus. On March 11, open reduction and internal fixation were performed. She healed satisfactorily. At 6 years and 2 months after the operation the passive ROM of her shoulder was full. Case 2-A 73-year-old man had an epileptic fit on December 23,2003. He was treated for rhabdomyolysis at another hospital. He came to our hospital on January 19, 2004. The roentgenogram showed sever displacement of both fractures of the greater and the lesser tuberosity of the right humerus, and the posterior fracture-dislocation of the left shoulder. On January 26, reconstruction of the rotator cuff with Teflon felt was performed in his right shoulder. The humeral head replacement was performed in the left shoulder. At 4 months after the operation, the active elevation of both his shoulders is 90 degree. These two cases had sever displacement of the both fractures of the greater and the lesser tuberosity, and the minimally displaced fracture of the anatomical neck of the humerus. This type of 3-part fracture is extremely rare and is not included Neer's classification or AO classification. Codman suggested this type of fracture, but he did not show a definite case. Their own muscle power by epileptic fit produced this rare type of fracture.
