上腕骨近位部ＡＯ分類Ｃ型，２・３part骨折の治療成績

概要

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The purpose of this study was to produce the clinical results of AO type C 2-,3-part fractures. 36 cases without a dislocation were classified into 3 types; 2-part fractures of the anatomical neck (C1-3), 3-part fractures of the valgus type (C1-1, C2-1), 3-part fractures of the varus type (C1-2, C2-2). 2 cases classified in the 2-part fracture of the anatomical neck were 94 year-old-women. 1 was treated by prosthetic replacement, the other was treated conservatively, and healed without avascular necrosis (AVN). 25 cases were classified in the 3-part of valgus type. They were 23 women and 2 men with an average age of 68 years old (ranging from 47 to 85). 21 cases were treated surgically, and 4 cases were treated conservatively. All cases healed without AVN, but 1 case fell into osteoarthritis. 9 cases were classified in the 3-part of varus type. They were one man and 8 women with an average age of 72 years old (ranging from 62 to 80). All cases were treated surgically and healed without AVN. We had one rare case of valgus type, which included both an anatomical and a surgical neck fracture. It was treated surgically and healed without AVN. We evaluated the results of AO type C 2-, 3-part fractures and all cases had no AVN. But this study had a problem. It was difficult to classify these fractures only by X-P. It is possible that our materials included type B fractures. We suggest that 3D-CT was very useful to classify these fractures.