Chinese Journal of Tissue Engineering Research ›› 2011, Vol. 15 ›› Issue (17): 3173-3176.doi: 10.3969/j.issn.1673-8225.2011.17.032

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Screw displacement following tibial fractures internal fixation under 100 and 500 N forces by digital speckle correlation method

Ye Li-jing1, Zhou Yi-ping2, Zou Qing-feng3, Guo Jia-zhi3, Li Zhong-ming3, Chen Ying-jie3   

  1. 1Department of Pediatrics, Yuxi Third People's Hospital, Yuxi  653100, Yunnan Province, China
    2Yunnan Key Laboratory of Pharmacology for Natural Products, Kunming Medical College, Kunming  650031, Yunnan Province, China
    3Department of Anatomy, Kunming Medical College, Kunming  650031, Yunnan Province, China
  • Received:2010-12-27 Revised:2011-02-20 Online:2011-04-23 Published:2011-04-23
  • Contact: Li Zhong-ming, Master, Lecturer, Department of Anatomy, Kunming Medical College, Kunming 650031, Yunnan Province, China coppyy1998@163.com Chen Ying-jie, Master, Professor, Department of Anatomy, Kunming Medical College, Kunming 650031, Yunnan Province, China chenyj2002@gmail.com
  • About author:Ye Li-jing, Associate chief physician, Department of Pediatrics, Yuxi Third People's Hospital, Yuxi 653100, Yunnan Province, China 761470408@qq.com Zhou Yi-ping, Doctor, Yunnan Key Laboratory of Pharmacology for Natural Products, Kunming Medical College, Kunming 650031 Ye Li-jing and Zhou Yi-ping equally contributed to this work.
  • Supported by:

    the Specific Foundation Program of Key Laboratory for Pharmacy, Yunnan High Institute, No. 6010902009-2010ZL004*; the Scientific Research Program of Education Department of Yunnan Province, No. 07Z10199*, 2010Y191*; the Specific Foundation Program of Yunnan Provincial Science and Technology Department and Kunming Medical College, No. 2007C0044R*,2009CD188*

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Abstract:

BACKGROUND: Biomechanical features of plate internal fixation for fractures are commonly analyzed utilizing sensor, which presents direct contact and low accuracy.
OBJECTIVE: To measure mean displacement of the forth and fifth screws under different tensile forces with internal fixation of compression plate for tibial fracture by digital speckle correlation method.
METHODS: The specimens of antisepsis adult tibia were spray with the silver for the digital speckle technique before the experiment. The tibia was desected from the middle point to establish model of middle segmental fracture. The compression plate was implanted below the posterolateral periosteum, and 4 lock screws inserted each from two ends of fracture into 4-layer cortical bone. The specimens included 6 conditions: group A: the tibia was not sawed with the steel, and internally fixed with 8 screws (simulation of bone healing); group B: the tibia was sawed at the middle point of the tibia on the basis of A; group C: the first screw of the upper end was removed on the basis of B; group D: the first screw of the lower end was removed on the basis of C; group E: the second screw of the upper end was removed on the basis of D; group F: the second screw of the upper end was removed on the basis of E. The measurements were performed from A to F. Under the tensile forces of 100 and 500 N, the displacement of the forth and fifth screws were measured with CSS-44100-e-universal test machine.
RESULTS AND CONCLUSION: Analysis of variance showed that under 100 N (F=3.107), group A and group F had significant differences (P < 0.05); under 500 N (F=4.719), group A and group F had significant differences (P < 0.05). The screws near the fracture line for tibial compression plate internal fixation were easily broken because of the large displacement. Therefore, the screw diameter is recommended to increase 1.0-2.0 mm following calculation.

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