目的 研究人体正常骨盆和髋臼发育不良骨盆的生物力学特征。方法 依据光弹性力学原理，应用光敏材料E-51环氧树脂制作人体骨盆三维光弹模型共4套，模型加载，应力冻结，测量分析骨盆的应力分布及形态改变。结果 人体双腿站立时，正常及髋臼发育不良骨盆环的应力集中在I7、I8、S4、A1、A2等处；髋臼发育不良时髋臼内壁应力异常集中于髋臼上缘，A1∶A4 =6∶1。负重后正常骨盆髋臼外口呈“椭圆形”改变。结论 人体骨盆应力分布复杂；人体双腿站立负重时髋臼可发生形态改变；髋臼发育不良时髋臼应力分布不均导致髋关节骨关节炎的发生。%Objective To investigate the biomechanic characteristic of normal human pelvis and pelvis with development displasia of h ip (DDH) by the three-dimensional photoelastics. Methods Four photoelastic models of human pelvis were made by using light-sensat ory material with hypersensitivity E-51 epoxy resin. The weight was put on mode l and performed froze stress, and the distribution of model stress and morphorlog ical change were observed. Results The stresses of human pelvic ring were concentrated on the parts, such as I7, I8, S4, A1, A2 . In DDH, stresses within acetabulum were concentrated on the parts of upper mar gin of acetabulum，such as A1∶A4=6∶1. In the loading pelvis, acetabular ou tlet became ellipse in shape. Conclusion Under standing condtion of double legs, stresses of human pelvic ring were complicated. In the loading pelvis, morphological changes of acetabulum occurred. In DDH, the abnorm al concentration of stresses within pelvis leads to the development of osteoarth ritis.
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