Fig. 1

Entire treatment course of a Pipkin type IV femoral head fracture in a patient with posterior hip dislocation status post motor vehicle collision. Initial AP pelvic radiograph (a) with posterior superior femoral head dislocation (arrow) and femoral head fracture, with a residual femoral head fragment remaining in the acetabulum (arrowhead). b Axial CT showing lipohemarthrosis, with floating fatty liquid suspending atop pooling blood (arrow), resulting from traumatic exposure of the marrow. c Bone windows from axial CT. Femoral head fracture and posterior dislocation better demonstrated. d Post reduction hip CT coronal. Minimally displaced fracture line visible (arrow). e Post-operative AP hip radiograph with femoral head screws