Chinese Journal of Tissue Engineering Research ›› 2012, Vol. 16 ›› Issue (22): 4019-4022.doi: 10.3969/j.issn.1673-8225.2012.22.007

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Digital speckle measurement of the displacement under internal fixation for fracture of femoral shaft****◆

Wang Zhi-hua1, Zhao Yun-wei2, Li Jing-hua3, Chen Ying-jie4, Ye Hong4, Zhou Yi-ping5, Li Zhong-ming4   

  1. 1Department of Emergency, 3Department of Ophthalmology, Second Affiliated Hospital of Kunming Medical University, Kunming  650221, Yunnan Province, China; 2Affiliated Hospital of Yunnan University of Finance and Economics, Kunming  650221, Yunnan Province, China; 4Department of Human Anatomy, 5Yunnan Key Laboratory of Pharmacology for Natural Products, Kunming Medical University, Kunming  650031, Yunnan Province, China
  • Received:2012-01-18 Revised:2012-03-16 Online:2012-05-27 Published:2012-05-27
  • Contact: Li Zhong-ming, Master, Lecturer, Department of Human Anatomy, Kunming Medical University, Kunming 650031, Yunnan Province, China coppyy1998@163.com
  • About author:Wang Zhi-hua, Attending physician, Department of Emergency, Second Affiliated Hospital of Kunming Medical University, Kunming 650221, Yunnan Province, China 410719128@qq.com
  • Supported by:

    the Associated Project of Department of Science and Technology of Yunnan Province-Kunming Medical University, No. 2007C0044R*, 2009CD188*; and the Project of the Department of Education of Yunnan Province, No. 2010Y191*, 07Z10199*

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Abstract:

BACKGROUND: The biomechanical features of the plate internal fixation for the fractures are commonly analyzed utilizing direct contact and low accuracy sensor. However, it has some limitations such as direct contact and low accuracy. The digital speckle method used in the biomechanics of fractures is more accurate to analyze the characteristics of the screw breakage.
OBJECTIVE: To measure the displacement of screws under different tensile force conditions after the internal fixation surgery of compression plate for adult thighbone using digital speckle method.
METHODS: A total of six femur samples from adults were used to prepare model of midshaft humerus fractures. Each of two ends of fractured samples was fixed with five screws, and the pull test was conducted under the load of 200 and 300 N by electronic versatile machine to measure the displacement of the screws under 10 conditions.
RESULTS AND CONCLUSION: The displacement distance of the screw was significantly longer under 300 N loading force compared with 200 N (P < 0.01). Except screws 1 and 10, 2 and 9, 3 and 8, 4 and 7, and 5 and 6, there were significant differences in the displacement between any two screws (P < 0.05). Results showed that the displacement of the screws increased with increasing pulling force, and the displacement near the fracture line significantly changed with pulling force.

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