大段骨移植骨接合面的生物力学研究(英文)

Biomechanical studies on the bone juncture of massive allograft

目的:探讨适合髓内固定的骨接合端处理方案的理论基础。方法:采用新鲜猪股骨25根,采用随机数字表法均分为横形截骨组,斜形截骨组,阶梯形截骨组,“V”形30°截骨组,“V”形45°截骨组。对所有标本进行压缩刚度,扭矩刚度,最大扭矩等生物力学实验,观察不同截骨形状的稳定性。结果:“V”形45°截骨接合的扭矩刚度值最大,横形最差。“V”形45°截骨在抗最大扭力时产生骨折;“V”形30°截骨接合部抗压缩性较好,有较强的抗扭转力,在最大扭矩实验中没有出现骨折。结论:在设计大段骨移植骨接合端时,采用“V”形30°角的处理方案,能提供这类骨接合更好的初期稳定性。

AIM:To study the theoretical basis of a more adaptive project in dealing with bone juncture. METHODS:Twenty five fresh porcine femurs were randomly divided into five groups: transversely resected group, obliquely resected group, stepladder shaped resected group, 30 degrees resected “V” shaped group and 45 degrees resected “V” shaped group. So, such biomechanical experiments as compression rigidity,torsion rigidity and maximal torsion were carried out, and the steadiness of differently resected bones were observed. RESULTS:In the test of torsion rigidity, the situation of 45 degrees resected group showed the best, 30 degrees resected group ranked the second and that of the transversely resected group list the worst. 45 degrees resected “V” shaped bone fractured when burdened with the maximal twisting force, while the 30 degrees resected “V” shaped bones did not fracture in the same test for their better properties of anti compression and anti torsion. CONCLUSION:The 30 degrees “V”shape resection manner can provide a better interface and more reliable initial steadiness for the bone juncture.