Classification

Grade I: Simple dislocation without fracture or with a chip from the acetabulum so small as to be of no consequence


Grade II: Dislocation with one or more large rim fragment, but with sufficient socket remaining to ensure stability after reduction


Grade III: Explosive or blast fracture with disintegration of the rim of the acetabulum, which produces gross instability


Grade IV: Dislocation with a fracture of the head or neck of the femur

Central Dislocations

Grade I: Linear or stellate fracture through the floor of the acetabulum but without appreciate dislocation


Grade II: Comminuted fracture with a mild to moderate central displacement of the femoral head and of the acetabular fragment


Grade III: Marked displacement of the fragments and protrusion of the head of the femur into the pelvis, with or without comminution of the superior portion of the acetabulum


Grade IV: Dislocation with an associated fracture of the head or neck of the femur

Explanation

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Figures

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Reference(s)

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