Ten cadaveric femurs were reamed and an appropriate Grosse-Kempf intramedullary nail was placed in them. To measure the “toggle,” the bending of the distal femoral segment around the nail, a special jig was constructed. Serial measurements of the toggle were made for osteotomies at selected sites between the isthmus and the supracondylar region of the femur. The anteroposterior toggle was measured with the proximal supracondylar screw only, the distal screw only, and both screws. Two screws always resisted anteroposterior toggle better than one screw. If the distal femoral fragment is long, one screw can adequately stabilize the nail—bone construct; with short distal fragments, two screws are needed.