镍钛形状记忆合金环抱式带锁髓内钉的生物力学评价
[Biomechanical evaluation of nickel-titanium shape-memory alloy enclosed interlocking intramedular nail].
作者信息
Cao Yan-ming, Zhao Wei-dong, Zhang Mei-chao, Bao Kan, Da Guo-zu
机构信息
Department of Orthopedics, Second Affiliated Hospital of Guangzhou Medical College, Guangzhou 510260, China.
出版信息
Nan Fang Yi Ke Da Xue Xue Bao. 2006 May;26(5):584-6.
OBJECTIVE
To study the biomechanical characteristics of Ni-Ti shape-memory alloy-enclosed interlocking intramedular nail Ni-Ti En for clinical application.
METHODS
Six transverse fractures were induced in 6 fresh humeral shafts and fixed with Ni-Ti En, plate, interlocking intramedullary nail, and Ender nail, respectively. The specimens then underwent stress analysis for comparison of the bending strength, twisting force, and flexibility.
RESULTS
The bending strength of Ni-Ti En was not significantly different from that of the plate and better than ender's nail; the twisting force of the interlocking intramedullary nail was comparable with the plate, but better than Ender nail.
CONCLUSION
Ni-Ti Enpossess good biomechanical property to meet the demand of osteosynthesis, and its less stress protection, freedom of distant nail locking, flexibility and stable fixation may accelerate fracture healing.
目的
研究镍钛形状记忆合金环抱式交锁髓内钉（Ni-Ti En）的生物力学特性，以便临床应用。
方法
在6根新鲜肱骨干上造成6处横行骨折，分别用Ni-Ti En、钢板、交锁髓内钉及Ender钉固定。然后对标本进行应力分析，比较其抗弯强度、抗扭力及柔韧性。
结果
Ni-Ti En的抗弯强度与钢板无显著差异，优于Ender钉；交锁髓内钉的抗扭力与钢板相当，但优于Ender钉。
结论
Ni-Ti En具有良好的生物力学性能，能满足骨接合的需要，其应力遮挡较小、远端交锁自由、柔韧性好及固定稳定，可能会加速骨折愈合。
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