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Table 3 Classification system of Femoral neck fracture combined with anterior dislocation of femoral head

From: Femoral neck fracture combined with anterior dislocation of the femoral head: injury mechanism and proposed novel classification

Type I Pauwels angle <30°, and no dislocation of the femoral head
Type II Pauwels angle is between 30°-50°, and no dislocation of the femoral head
Type III Pauwels angle >50°, and no dislocation of the femoral head
TypeIV Pauwels angle >50°, accompanied by anterior dislocation
a anterior pubic dislocation
b obturator subluxation
c subpubic dislocation
TypeV Pauwels angle>50°, accompanied by anterior dislocation
a obturator dislocation of the femoral head
b pelvic dislocation