[Experimental studies on the stability of femoral head spongiosa in reference to a new type blade profile of a 130-degree angle plate].

The fracture of the trochanter major during and after angle plate-osteosynthesis of pertrochanteric fractures in mind, we made a 130 degrees-angle plate for experimental investigations with an only 6 mm broad blade profile. Therefore the lateral femoral corticalis will be weakened much less. The question was, whether this blade would be stable enough in the spongiosa of the femoral head with regard to the stability of the osteosynthetic system. For this the two methods of osteosynthesis were exposed to dynamic stress. The investigations were done with bone specimens by right-left-comparison with the new plate on the one side and the well-known 130 degrees-angle plate on the other side. The results show, that the new blade with the narrow profile has rather the same stability in the spongiosa of the femoral head as the AO-angle plate.