UCSD Musculoskeletal Radiology bonepit.com MSK Classifications

Femoral head fractures - Pipkin Classification

Type I         Fracture below fovea / ligamentum (small), Does not involve the weightbearing portion of the femoral head

Type II         Fracture above fovea / ligamentum (larger), Involves the weightbearing portion of the femoral head 

Type III        Type I or II with associated femoral neck fx.  High incidence of AVN

TypeIV         Type I or II with associated acetabular fx (usually posterior wall fracture)