膨胀自锁髓内钉试件的生物力学评价

Biomechanical Evaluation about Standard Specimen of Intramedullary Expand Self-locking Nail(IES)

对一种新型无需传统锁钉的膨胀自锁髓内钉试件进行生物力学性能测试和评价,将6对新鲜股骨标本均分为两组,做成长约10cm的骨段,分别用膨胀自锁髓内钉试件和国产传统交锁髓内钉试件内固定。分别对其进行轴向压缩载荷、水平扭转及三点弯曲等生物力学测试,用SPSS13.0统计软件进行统计分析。结果两端膨胀自锁髓内钉的抗短缩刚度、抗旋转刚度及抗弯曲刚度均略小于交锁髓内钉,无显著差异。说明膨胀自锁髓内钉与交锁髓内钉相当,具有较强抗压、抗弯、抗旋性能,符合生物学固定的要求,有较好的临床推广应用前景。

A new kind of internal fixation, witch without the orthodox lockpin-the standard spencimen of Expand Self-locking Nail（IES）, a biomechanic test were made. Six pairs fresh adult moist cadaveric femur specimens were used to manufacture bone model about 10 cm. Group 1 were fixed using the standard specimen of intramedullary expand self-locking nail and group 2 were fixed by the standard specimen of homemade interlocking nail. All specimens were made biomechanic test and the data was analysed by static SPSS13.0 software. The stiffness of group 1 in resisting rotation and axial displacement and resist bending were smaller than that of the group 2. But there was not static different between two groups. It is conclused that being used in bone model, the internal fixture of intramedullary expand self - locking nail is firm and dependable, with enough power resisting rotation and axial displacement and resist bending of the function, and accorded with the principle of biology fixation. It would be widely used in clinical practice.