人体股骨弹性模量与骨矿含量的关系

RELATIONSHIP BETWEEN THE ELASTICITY MODULUS AND THE MINERAL CONTENT OF THE SHAFT OF HUMAN DRY FEMUR

选取正常男性成人股骨18段,制成5—20mm测试块202个,用Ⅱ型γ线骨矿分析仪测得骨矿含量面密度分别为1.324—1.901g/cm^2,再用WE—10(A)型液压式万能试验机和千分表测得测试块受纵向压应力时所承受的压力及相应的高度变化并计算其弹性模量。结果显示:骨矿含量在1.802g/cm^2以下时,弹性模量及力学性能与骨矿含量呈正相关关系,但超出此范围后,骨矿含量的增加可能会使骨的力学性能下降。

In order to clarify the relationship between the elasticity modulus (Youngs modulus) and the mineral content of the shaft of human femur, the present authors chose 18 normal male dry femurs around 40 years of age cut into 202 slices as testing samples around 5-20 mm. The mineral content of every sample was measured by the γ- ray mineral content of bone analysis apparatus and the longitudinal stress by the WE-10(A) Universal Test Machine in the elasticity limitation of femur; the change of thickness of every sample was measured by the micrometer. Then the elasticity modulus of each sample was computed. The results are as follows: the area density of mineral content of femur shaft varies from 1.3g/ cm2 to 1.9g/ cm2. The elasticity moduli vary directly with the mineral content under 1.8g/ cm2 while inversely with it when above 1.9g/ cm2. Finally their relationship as well as significances has been discussed.