Chinese Journal of Tissue Engineering Research ›› 2011, Vol. 15 ›› Issue (43): 7991-7993.doi: 10.3969/j.issn.1673-8225.2011.43.003

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Measuring the displacement of the steel plate for humeral fractures under 100 N and 400 N by the digital speckle method

Zhao Yun-wei1, Zhou Yi-ping2, Chen Ying-jie3, Li Zhong-ming3, Ye Hong4, Kong Wei-yun5   

  1. 1Department of Clinic, Yunnan University of Finance and Economics, Kunming  650221, Yunnan Province, China; 2Yunnan Key Laboratory of Pharmacology for Natural Products, 3Department of Anatomy, 4United Front Work Department, Kunming Medical University, Kunming  650031, Yunnan Province, China; 5Department of Orthopedics, Second People’s Hospital of Yunnan Province, Kunming  650021, Yunnan Province, China
  • Received:2011-04-24 Revised:2011-09-01 Online:2011-10-22 Published:2011-10-22
  • Contact: Ye Hong, Assistant, United Front Work Department, Kunming Medical University, Kunming 650031, Yunnan Province, China 191229169@qq.com Correspondence to: Kong Wei-yun, Studying for doctorate, Attending physician, Department of Orthopedics, Second People’s Hospital of Yunnan Province, Kunming 650021, Yunnan Province, China kongweiyunkm128@126.com
  • About author:Zhao Yun-wei, Attending physician, Department of Clinic, Yunnan University of Finance and Economics, Kunming 650221, Yunnan Province, China 353589354@qq.com Zhou Yi-ping☆, Doctor, Associate professor, Yunnan Key Laboratory of Pharmacology for Natural Products, Kunming Medical University, Kunming 650031, Yunnan Province, China 1401545363@qq.com Chen Ying-jie★, Master, Professor, Department of Anatomy, Kunming Medical University, Kunming 650031, Yunnan Province, China chenyj2002@foxmail.com Li Zhong-ming★, Master, Lecturer, Department of Anatomy, Kunming Medical University, Kunming 650031, Yunnan Province, China 297192563@qq.com Zhao Yun-wei, Zhou Yi-ping, Chen Ying-jie and Li Zhong-ming contributed equally to this study.
  • Supported by:

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

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Abstract:

BACKGROUND: The digital speckle method used in biomedicine is more accurate to analyze the characteristics of screw breakage.
OBJECTIVE: To measure the displacement of the humeral steel screw by the digital speckle method.
METHEDS: A total of 4 root humeri were used, and humeral middle segment fracture was made by sawing at 1/2 of the humerus. The fracture sample was reduced, and fixed using 8-well plate with 4 screws at each end. Five conditions (before and after the fracture) were designed to compare the displacement of the screws. The displacement was calculated under 100 and 400 N tensile force. Condition A was a strengthened plate fixation (no sawed, no fracture); Condition B was to remove a screw at the proximal end after fracture; Condition C was to remove a screw at the distal based on B; Condition D is to remove a screw at the proximal based on C; Condition E was to remove a screw at the distal based on D. Two MEDAL screws displacement at both ends were calculated by using relevant softwares.
RESULTS AND CONCLUSION: Under 100 N and 400 N tension, there were significant different displacement of the two screws symmetrically distributed at both fracture lines as other screws decreased (P < 0.01). Stress difference of the two screws symmetrically distributed beside fracture line ends had no remarkable significance by further binary comparison (P > 0.05). The two screws which were just located near the two fringes of the fracture line undertaken more stress and collapsed easily. It would be better to choose the screw with the screw pore of diameter 100-2.5 mm longer than the present one, in order to increase its stability to avoid the breakage.

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