垂直载荷下静力位正常骨盆的生物力学研究

Biomechanical research on the statically determinate pelvis under vertical loading

目的探讨静力位正常骨盆在垂直载荷下的生物力学情况,为骨盆骨折各种生物力学测试提供生物力学参数。方法 5具骨盆标本应用应变电测法,在不同载荷作用下对正常国人骨盆应变分布、刚度及位移进行测定,采集8个反复1500N载荷情况下骨盆的各个部位的应变值进行比较。结果骶髂关节处应变最大,骨盆能承受2000N以上的载荷,在8次1500N的反复载荷下,骨盆的刚度和应变未出现明显改变。结论垂直载荷下,骶髂关节处应变最大,为骨折的好发部位,正常骨盆的极限失效点在2000N以上,1500N的垂直载荷位于骨盆的弹性区间之内。

Objective To explore the normal pelvic biomechanical distribution under the vertical loading in statically determinate model and obtain the biomechanical parameters for various biomechanical tests in the pelvis fracture in future.Methods With the strain electrometric methods,we detect the strain distributions,stiffness,displacements under the different load,then gather and compare the eight repeated strain values in different locations of pelvis under the load of 1500N in 5 specimens.Result The greatest variance of strain is at the iliosacral joint,the load more than 2000N can be endured by the pelvis;after the eight-cycle loads of 1500N,the strain and stiffness do not change conspicuously.Conclusion Iliosacral joint is a predilection site in the pelvis fracture.The ultimate failure point is more than 2000N.The load of 1500N is between the elastic interval of pelvis.