According to Sanders classification, 8 cases were type Ⅱ fractures( type ⅡA, type ⅡB, type ⅡC) and cases were type Ⅲ fractures( type ⅢAB, type ⅢAC, type ⅢBC).

SandersⅡ型8例(ⅡA型例,ⅡB型例,ⅡC型例),Ⅲ型例(ⅢAB型例,ⅢAC型例,ⅢBC型例)。