Mensch J S, Markolf K L, Roberts S B, Finerman G M
J Bone Joint Surg Am. 1976 Mar;58(2):185-90.
One of each of thirty-five pairs of fresh intact femora were tested to failure in torsion, recording the dynamic torque, the absorbed energy, and the angle of rotation. These results were compared with the results obtained with the contralateral femur, reconstituted after removal of a segment. Intramedullary nails with polymethylmethacrylate cement, strips of titanium mesh with cement, bone plates with and without cement, and multiple Steinmann pins with cement were the reconstituting configurations. Bone plates were the strongest configuration; the failure torques in all cases were limited by the stress concentration effects of the holes in the bone used for screw fixation. The use of cement as an adjunct to single-plate fixation provided some additional strength. The torsional strength of femora fixed with Küntscher and Schneider nails was limited by failure of the cement and bone. The use of titanium mesh with polymethylmethacrylate was less effective, because this composite has a low torsional rigidity. The use of multiple Steinmann pins packed with polymethylmethacrylate in the medullary cavity should be discouraged because severe twisting and fragmentation of the surrounding acrylic will occur at low levels of torque.
对35对新鲜完整的股骨中的每对中的一根进行扭转破坏试验，记录动态扭矩、吸收能量和旋转角度。将这些结果与对侧股骨（去除一段后重建）所获得的结果进行比较。使用聚甲基丙烯酸甲酯骨水泥的髓内钉、带骨水泥的钛网条、带和不带骨水泥的骨板以及带骨水泥的多根斯氏针作为重建构型。骨板是最强的构型；在所有情况下，破坏扭矩都受到用于螺钉固定的骨孔处应力集中效应的限制。使用骨水泥作为单钢板固定的辅助手段可提供一些额外的强度。用Küntscher钉和Schneider钉固定的股骨的抗扭强度受到骨水泥和骨破坏的限制。使用聚甲基丙烯酸甲酯的钛网效果较差，因为这种复合材料的抗扭刚度较低。不应鼓励在髓腔内使用填充有聚甲基丙烯酸甲酯的多根斯氏针，因为在低扭矩水平下周围的丙烯酸会发生严重扭曲和破碎。
