老年人髋关节软骨负重区和非负重区的拉伸力学性能研究

目的研究髋关节负重对髋关节软骨拉伸力学特性的影响。方法取11例股骨颈骨折（头颈型）病人（男性4例．女性7例，年龄70～85岁）的正常新鲜髋关节软骨负重区和非负重区．做哑铃型试件共22个。用Bose Endura TEC3270动态生物力学测试机进行一维拉伸试验，测定髋关节的破坏载荷、伸长比、Lagrange拉应力、Cauchy拉应变，做应力-应变曲线，比较两区的力学特性。结果软骨的应力-应变曲线呈现非线性指数曲线关系。负重区的拉伸性能破坏载荷38．183N．伸长比1．166，应力5．968MPa，应变17．888％；非负重区拉伸性能破坏载荷25．565N，伸长比1．148，应力4．379MPa，应变15．970％。两区比较．差异有统计学意义。结论髋关节关节软骨负重区优于非负重区拉伸力学性能。

Tensile mechanical characteristics of weight-bearing and non-weight-bearing area in elderly hip cartilage

Objective To study the effects of weight-bearing on tensile mechanical characteristics of the elderly hip cartilage. Methods Healthy fresh weight-bearing and non-weight-bearingarea of hip cartilage from 11 patients (male 4,female 7,aged 70-85 years) were removed, 22 pieces of dumbbell-shaped specimen were made, the one-dimensional tensile test was performed with Bose Endura TEC3270 dynamic biomechanical testing machine, then the tensile destructive load, stretch ratio, stress, strain, stress-strain curve we...