髁突手术对其压缩力学性能及骨密度的影响

Effects of various condylar operations on its compressive mechanical property and bone density

目的探讨不同术式后髁突力学性能的变化及其与材料特性之间的关系。方法采用压缩力学性能测试技术和双能Ｘ线吸收法，定量分析１２侧正常、６侧髁突高位切削术及６侧关节重建术的成年杂种犬髁突的压缩力学性能和骨矿含量。结果髁突的载荷与位移呈非线性关系。其弹性极限负荷及位移、最大负荷及位移以正常组为最高，而刚度及骨矿含量则以切削组为最高，减径组各项指标均最低。３组髁突弹性极限负荷、最大负荷及刚度与骨密度之间均有显著或极显著意义的相关性，相关系数在０．８６２以上。结论不同术式造成的髁突形态改变直接影响其力学性能和骨矿含量。

Objective To investigate the changes and relationship of condylar mechanical properties and its material character after various condylar operations. Methods Condylar compressive mechanical properties and its bone mineral content were analyzed quantitatively by compressive mechanical property measurement technique and dual energy X-ray absorptiometry in 6 and 6 adult dogs undergone either high shaping or reconstruction of condyles respectively, and compared with 12 normals. Results Condylar elastic-limit load and displacement, its largest load and displacement were the highest in control, but stiffness and bone mineral content were the highest in highshaping group, all data were the lowest in the reconstruction ones. There was marked and extremely marked linear positive relativity among condylar elastic-limit load, largest load, stiffness and bone density, in which all relative coefficients exceeded 0.862. Conclusion The changes of condylar shape induced by various operations directly influence its compressive mechanical properties and bone mineral content. There is linear positive relativity between condylar compressive mechanical properties and its bone mineral density.