Chinese Journal of Tissue Engineering Research ›› 2010, Vol. 14 ›› Issue (17): 3123-3126.doi: 10.3969/j.issn.1673-8225.2010.17.021

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Biomechanical performance and effect of static interlocking intramedullary nails on femoral fracture healing

Yan Xue-gang1, Bao Tong-zhu2, Zhao Wei-dong3, Yan Fei2, Liang Dong-zhu3, Ding Zhi-bing4   

  1. 1 First College of Clinical Medical Science, Three Gorgers University, Yichang  443003, Hubei Province, China; 2 Yichang Central People’s Hospital, Yichang  443003, Hubei Province, China; 3 Key Laboratory of Medical Biomechanics, Southern Medical University, Guangzhou  510515, Guangdong Province, China;    4  Laboratory of Anatomy, Three Gorges University Medical School, Yichang  443002, Hubei Province, China
  • Online:2010-04-23 Published:2010-04-23
  • Contact: Bao Tong-zhu, Chief physician, Yichang Central People’s Hospital, Yichang 443003, Hubei Province, China baotongzhu1963@163.com
  • About author:Yan Xue-gang★, Studying for master’s degree, First College of Clinical Medical Science, Three Gorgers University, Yichang 443003, Hubei Province, China yanxg297@163.com
  • Supported by:

    the Scientific Research Program of Hubei Province, No. A05302-02*

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Abstract:

BACKGROUND: Interlocking intramedullary nails (SIiN) is frequently used to treat femoral fracture. Routine pulling and compression and postoperative motorization are important for fracture healing. To improve fracture healing rate has been focused using various factors.
OBJECTIVE: To explore the biomechanical performance of static SIiN in fixation of femoral fracture, and the effect on fracture healing.
METHODS: A total of 8 pairs of femurs from adult cadavers immersed in formalin were used to prepare models of midpiece transverse fracture. The fracture was respectively fixed using static SIiN, TiNi shape-memory sawtooth-arm embracing internal fixator (TiNi SMA), and dynamic compression plate (DCP). The anti-compression, anti-bending, and anti-torsion rigidity were measured, and the stress shielding rate was calculated.
RESULTS AND CONCLUSION: SIiN was similar to DCP group in anti-compression rigidity and anti-bending rigidity (P > 0.05), but the anti-torsion was lower than DCP group (P < 0.05). Compared with TiNi SMA group, SIiN displayed greater anti-compression rigidity and anti-bending rigidity (P < 0.05), but similar anti-torsion (P > 0.05). SIiN was similar to DCP group in stress shielding rate (P > 0.05), but significantly greater than TiNi SMA group (P < 0.01). The biomechanics of SIiN was stable, but the stress shielding rate was high. Changing static interlocking into dynamic interlocking in time is necessary in clinic to promote fracture healing.

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