Figure 8

Difference between 2D and 3D image information; screenshots taken from FluoroMap software (solid lines represent the real surface of the femoral head based on 3D information, dotted lines represent the outline of the femoral head as shown in 2D radiographs). (a) Congruence of the visible and actual 3D distance to the bone surface in case of a centric lag screw placement, (b) lack of congruence of the visible and actual 3D distance to the bone surface in case of an eccentric lag screw placement, (c) penetration of the femoral head surface despite inconspicuous 2D imaging, (d) 3D reconstruction of the femoral head revealing the penetration of the femoral head surface.