Displacement of steel plate for humeral fractures under the load of 100 N and 500 N measured using digital speckle method

doi:10.3969/j.issn.2095-4344.2013.52.016

Chinese Journal of Tissue Engineering Research ›› 2013, Vol. 17 ›› Issue (52): 9035-9040.doi: 10.3969/j.issn.2095-4344.2013.52.016

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Displacement of steel plate for humeral fractures under the load of 100 N and 500 N measured using digital speckle method

Yang Li-ping¹, Tian Ming², Zhou Yi-ping³, Ye Hong⁴, Li Bi-jun⁵, Chen Ying-jie⁶

¹Kunming Judicial Expertise Center of Forensic Medicine Hospital, Kunming 650214, Yunnan Province, China; ²Department of Biology, Kunming Medical University, Kunming 650500, Yunnan Province, China; ³Yunnan Key Laboratory of Pharmacology for Natural Products and College of Pharmacy, Kunming Medical University, Kunming 650500, Yunnan Province, China; ⁴Department of United Front Work, Kunming Medical University, Kunming 650500, Yunnan Province, China; ⁵Department of Human Histology and Embryology, Hubei Medical University, Shiyan 442000, Hubei Province, China; ⁶Department of Anatomy, Kunming Medical University, Kunming 650500, Yunnan Province, China

Revised:2013-09-18 Online:2013-12-24 Published:2013-12-24
Contact: Li Bi-jun, Lecturer, Department of Human Histology and Embryology, Hubei Medical University, Shiyan 442000, Hubei Province, China 516209179@qq.com Chen Ying-jie, Professor, Department of Anatomy, Kunming Medical University, Kunming 650500, Yunnan Province, China 1984818576@qq.com
About author:Yang Li-ping, Coroner-in-charge, Kunming Judicial Expertise Center of Forensic Medicine Hospital, Kunming 650214, Yunnan Province, China kmfyy@126.com Tian Ming, Master, Associate professor, Department of Biology, Kunming Medical University, Kunming 650500, Yunnan Province, China 761470408@qq.com Zhou Yi-ping, Doctor, Associate professor, Yunnan Key Laboratory of Pharmacology for Natural Products and College of Pharmacy, Kunming Medical University, Kunming 650500, Yunnan Province, China 1073452689@qq.com Ye Hong, Master, Assistant, Department of United Front Work, Kunming Medical University, Kunming 650500, Yunnan Province, China 191221969@qq.com Yang Li-ping, Tian Ming, Zhou Yi-ping, and Ye Hong contributed equally to this paper.
Supported by:
the Union Specific Foundation of Yunnan Province Technology Department and Kunming Medical University, No. 2007C0043R, 2011FZ098X**; the Scientific Research Project of Yunnan Province Education Department, No. 07Z10199, 2010Y191, 03Y508C, 13000035, 2010ZL004*****; the National Natural Science Foundation of China, No. 31101616, 31160425**

Abstract

Abstract:

BACKGROUND: There is no unified measure of bone tissue mechanical property test at present. The study concerning traditional sensor for fracture displacement had some problems such as low precision, and high consumption cost.
OBJECTIVE: To measure the displacement of plate and screw after internal fixation for fracture of humerus using digital speckle method.
METHODS: A total of eight humeral specimens were taken. The steel plate fixation model in the humerus 1/2 was made. The specimens were fixed using eight-hole steel plate, and four screws were fixed on each end of fracture line. Five conditions of experimental model were designed for comparative analysis. Condition a: compression plate fixation group (not saw off, to simulate fracture healing). Condition b: on the basis of sawing off in condition a, one screw was removed on the proximal end. Condition c: on the basis of condition b, one screw was removed on the distal end. Condition d: on the basis of condition c, one screw was removed on the distal end. Condition e: on the basis of d, one screw was removed on the distal end. The screws were numbered No. 1-8 from top to bottom. That is, the screws on upper fracture line were numbered No. 1-4, and those on the lower fracture line were numbered No. 5-8. The specimens were installed on electronic universal testing machine, and loaded 100 N and 500 N. The displacement was calculated using the related software.
RESULTS AND CONCLUSION: Significant differences in total displacement were detected under different loads (F=49.155, P < 0.001). With increased load, the total displacement of the fourth and fifth screws gradually increased under five kinds of conditions. These indicated that the two screws on the two ends of the fracture line endured more stresses (stress concentration), and easily broke. It would be better to choose the screw with the screw diameter of 1-2.5 mm bigger than the present one in order to increase its stability to avoid the breakage of screws.

中国组织工程研究杂志出版内容重点：人工关节；骨植入物；脊柱；骨折；内固定；数字化骨科；组织工程

全文链接：

Key words: fractures , humerus , internal fixators , biomechanics , fractures , stress

CLC Number:

R318

Yang Li-ping, Tian Ming, Zhou Yi-ping, Ye Hong, Li Bi-jun, Chen Ying-jie. Displacement of steel plate for humeral fractures under the load of 100 N and 500 N measured using digital speckle method[J]. Chinese Journal of Tissue Engineering Research, 2013, 17(52): 9035-9040.

Figures/Tables 3

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Displacement of steel plate for humeral fractures under the load of 100 N and 500 N measured using digital speckle method

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