新型点接触锁定加压接骨板的生物力学研究

Biomechanical research on a new designed point compress locking plate

目的对一种集合点状接触、锁定及加压于一体的新型接骨板(PC-LCP),进行弯曲力学特性、生物力学稳定性测试评估。方法对三种医用不锈钢接骨板,点接触锁定加压接骨板(PC-LCP)、有限接触动力加压接骨板(LC- DCP)、动力加压接骨板(DCP)各3副进行四点弯曲试验;20对新鲜山羊胫骨制成横断骨折,应用三种接骨板固定,进行四点弯曲、扭转及垂直压缩试验。结果PC-LCP弯曲刚度弱于DCP、LC-DCP,三者有显著差异(P<0.05),但三种接骨板固定骨折后的生物力学特性没有显著差异。结论强度稍低的新型接骨板PC-LCP固定骨折后与其它两种接骨板有同样的生物力学强度及较好的力学稳定性。

Objective Designanewtypebone plate PC-LCP and determine its mechanical properties and the biomechanical stability. Method Four point bending test was conducted to determine the mechanical properties of each of the 3 pairs of PC-LCP. LC-DCP. DCP; using 20 pairs of new fresh sheep tibia, mid-shaft transverse fracture were created and fixed with PC-LCP. LC-DCP. DCP, respectively; and then the four point bending, torsion and axial compress tests were conducted to determine the bending .torsion and axial compress stiffness. Result Although the bending stiffness of PC-LCP is less than that of DCP, LC-DCP and have significant difference, the biomechanical properties of fixed fracture bone by these three type bone plate showed no significant difference. Conclusion The new PC-LCP has the similar biomechanical properties as the other two type plates when used to fix the broken bone and has the adequate stability.