The weight-bearing capacity of the GN (4,230-5,557 N) was about 100% higher than that of the DHS (2,465-3,049 N). The total deformation was 1/3 higher for the DHS (17.3 +/- 2.06 mm) than for the GN (10.73 +/- 4,33 mm). After 100,000 alternating load cycles no instability and a total deformation of 13.3 mm was found for the GN, but for the DHS instability occurred after 15,800 cycles. The migration of the I-beam GN plate at 1,000 N in sowbone femora was 0.7 mm for the gamma screw 1.69 mm and for the PFN 2 mm but one cut-out was observed. At 1,500 N the difference are even higher, all three PFN showed a cut-out and in two of the three gamma screws rotation of the head and neck around the screw was observed. In the cadaver tests similar differences were found with a migration at least double that of the GN I beam plate for the gamma screw and the PFN double-screw fixation. There was no difference between the gamma and PFN fixation in the cadaver pair test.