Biomechanical analysis of fracture fixation with external fixator in vivo

MING Jiang-hua; ZHOU Pang-hu; ZHOU Jian-peng

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Biomechanical analysis of fracture fixation with external fixator in vivo

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＜正＞Objective: To investigate the different ways of measuring the main axial strain during treatment with an external fixator and to find the suitable compression loaded by the external fixator at an early stage. Methods: Eighteen healthy big-ear rabbits were randomly divided into two groups according to different measuring methods: Group A and Group B. In Group A, a strain gauge was affixed to the external tibial cortex with 502 glue, and in Group B, a bone cement-coated strain gauge was installed on the internal tibial cortex. Groups A and B were divided into two subgroups A1, A2 and B1, B2, respectively, according to the pressure of half of and the same as the body weight. A Z-shaped left mid-shaft tibial osteotomy was performed and fixed by an external fixator. Results: The sealer curves of Group A changed dramatically during the early stage. The trendlines of the internal and external cortex went consistently after reaching the stable stage while the latter strain value was higher than the former. The time for Group B reaching the stable stage was short, but its absolute strain value was less than that of Group A. Before they were pressed to the stable stage, the declined speed of Subgroup A1 was more slowly than that of Subgroup A2 while the results of Subgroups Bl and B2 were same. Group A had an ascending trend after it declined while Group B didn’ t have. After they reached the stable stage, both Subgroups Al and A2 had a declining trend while Subgroup A2 was more quickly than Subgroup A1, Subgroup Bl was kept at a definite level while Subgroup B2 fluctuated. Conclusions: The axial strain under external fixator can be measured by bone cement coated-strain gauge in vivo. The data may suggest that half of the body weight load was suitable for external fixator.

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来源
《中华创伤杂志：英文版》 |2006年第2期|100-104|共5页
作者
MING Jiang-hua; ZHOU Pang-hu; ZHOU Jian-peng;
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作者单位

Department of Orthopedics Renmin Hospital of Wuhan University Wuhan 430060;

China;

Department of Orthopedics Renmin Hospital of Wuhan University;

Wuhan 430060;

China;

Department of Orthopedics Renmin Hospital of Wuhan University;

Wuhan 430060;

China;

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原文格式 PDF
正文语种 chi
中图分类骨折、骨的损伤;
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机译：骨折固定;生物力学;外固定架;

Biomechanical analysis of fracture fixation with external fixator in vivo

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