- Type Ⅰ: Fracture below fovea (does not involve weight bearing area)
- Type Ⅱ: Fracture above fovea (involves weight bearing area)
- Type Ⅲ: Type Ⅰ or Type Ⅱ with associated femoral neck fracture
- Type Ⅳ: Type Ⅰ or Type Ⅱ with associated acetabulum fracture (usually posterior wall)