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The Pipkin classification. (A) Type I: femoral head fracture inferior to the fovea centralis. The ligamentum capitis femoris inserting in the fovea centralis is shown. (B) Type II: femoral head fracture superior to the fovea centralis. (C) Type III: femoral head fracture inferior or superior to the fovea centrals with an associated femoral neck fracture. (D) Type IV: femoral head fracture inferior or superior to the fovea centrals with an associated acetabular fracture.
