Fig. 1From: Conventional versus helical blade screw insertion following the removal of the femoral head screw: a biomechanical evaluation using trochanteric gamma 3 locking nail versus PFN antirotationA The conventional- and helical blade-type hip screws used. Cross and longitudinal sections after insertion into the bone model are indicated. B A special box made to insert a screw at the same location and depth in the polyurethane bone model for testing. C Two types of hip screws are inserted in the experimental bone model, which are cut to the same size and heightBack to article page