Vasenius J, Pohjonen T, Törmälä P, Penttilä A, Rokkanen P
Department of Orthopaedics and Traumatology, University Central Hospital, Helsinki, Finland.
J Biomed Mater Res. 1998 Feb;39(2):171-5. doi: 10.1002/(sici)1097-4636(199802)39:2<171::aid-jbm1>3.0.co;2-m.
The initial stability of femoral neck osteosynthesis provided by three self-reinforced poly-L-lactide (SR-PLLA) or three metallic cannulated screws was compared. A standard transverse subcapital osteotomy was created with a hand saw in 19 pairs of human cadaver femora. Two fixation methods were randomly used in each pair. Fixations were exposed to a progressive cyclic loading test to determine the deflection curves, the ultimate load-carrying capacity, and the total amount of load absorbed. One pair served as a pilot and two nonoperated pairs served as controls. The positioning of the three fixation screws, whether one screw proximally and two screws distally or vice versa, provided equal stability. Metallic fixation proved to be more stable than SR-PLLA fixation as the average maximum load-carrying capacity was 3400N for the metallic and 2600N for the SR-PLLA fixation. However, SR-PLLA screws showed sufficient fixation properties for considering clinical trials in Garden I-II femoral neck fractures in well cooperative patients.
比较了三种自增强聚-L-丙交酯（SR-PLLA）或三种金属空心螺钉提供的股骨颈骨合成的初始稳定性。用手锯在19对人尸体股骨上制作标准的经股骨颈基底横断截骨术。每对随机使用两种固定方法。对固定装置进行渐进性循环加载试验，以确定挠度曲线、极限承载能力和吸收的总载荷量。一对作为预试验，两对未手术的作为对照。三个固定螺钉的定位，无论是近端一个螺钉和远端两个螺钉，还是反之，都提供了相同的稳定性。金属固定被证明比SR-PLLA固定更稳定，因为金属固定的平均最大承载能力为3400N，SR-PLLA固定为2600N。然而，SR-PLLA螺钉显示出足够的固定性能，可考虑在合作良好的患者中对Garden I-II型股骨颈骨折进行临床试验。
