漏斗胸肋软骨生物力学特性研究

Mechanical properties of costal cartilage of the children with pectus excavatum

目的 探讨漏斗胸肋软骨生物力学特性。方法 19例漏斗胸患儿肋软骨手术标本经处理后 ,用日本岛津AG 10 0 0A电子式万能实验机行拉伸、压缩和弯曲试验 ,载荷精度 0 .2 5 % ,加载速度 5mm/min。取年龄相同死于非骨骼肌肉系统疾病的尸体标本作对照。记录应力 应变关系曲线或应力 时间关系曲线并根据该曲线计算平均最大压缩、拉伸、弯曲强度和平均最大应变。结果 病变组拉伸强度、压缩强度、弯曲强度和平均最大应变均小于对照组。在相同的应力作用下 ,病变组的应变较大。病变组破坏应力也小于对照组。结论 漏斗胸肋软骨生物力学性能有下降 。

Objective To evaluate the properties of costal cartilage of the children with pectus excavatum (PE).Methods The tests of tension, compression and flexion of costal cartilage from both the PE group and controls were conducted by a testing apparatus (AG 1000A, Shimazu, Japan). The loading accuracy was 0.25% and the rate of loading was 5?mm/min. The curves of the stress strain or the stress-time were recorded.Results The average maximum strain and the strength of tension, compression and flexion of the PE were lower than those in the control group. The strain of pectus excavatum was greater than that in the control group under the same stress. And the damage stress of PE was lower than that in the control group.Conclusions The properties of the costal cartilage of PE were reduced, and this change might be related to the development of PE.