Increasing the holding strength by giving bone cement under pressure through holes between threads of cannulated screw in femoral neck fractures.
Femoral neck fractures are one of the most common fracture types in elderly patients. Failure of the internal fixation may develop, because most of the patients are aged and osteoporotic.The purpose of the work was to evaluate a modified 7 mm cannulated screw for the fixation of femoral neck fractures that provides increased fixation strength in osteoporotic bones. 16 human femoral heads divided into two groups after measuring bone mineral densities by Q-CT. In the control group 7 mm cannulated screws and in the study group 7 mm cannulated screws with holes between the threads augmented by cement (PMMA) were used.Pull out strength values werecompared after mating these groups by similar bone mineral densities.Modification of the 7 mm cannulated screws together with cement augmentation significantly increased the pull out strength values(p<0,011)when compared with standard 7 mm cannulated screws. This modified screw augmented with bone cement can significantly enhance the fixation stability in osteoporotic bones.
Введение цемента из отверстий в прорезной часте у винта с каналами при переломе шейки бедренной кости с помощью которой повышается сила укрепления.