Chinese Journal of Tissue Engineering Research ›› 2011, Vol. 15 ›› Issue (30): 5552-5555.doi: 10.3969/j.issn.1673-8225.2011.30.011

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Measuring the deformation of the intramedullary nail for the femoral fractures under 200-400 N by the digital speckle method

Wu Bang-guo1, Yan Jia2, Li Zhong-ming2, Zhou Yi-ping3, Kong Wei-yun4, Chen Ying-jie2   

  1. 1Department of Nuclear Medicine, Zhaotong First People’s Hospital, Zhaotong  657000, Yunnan Province, China
    2Department of Anatomy, Kunming Medical University, Kunming  650031, Yunnan Province, China
    3Yunnan Key Laboratory of Pharmacology for Natural Products, Kunming Medical University, Kunming  650031, Yunnan Province, China
    4Department of Orthopedics, Second People’s Hospital of Yunnan Province, Kunming  650021, Yunnan Province, China
  • Received:2011-03-15 Revised:2011-06-15 Online:2011-07-23 Published:2011-07-23
  • Contact: 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 Correspondence to: Chen Ying-jie, Master, Professor, Department of Anatomy, Kunming Medical University, Kunming 650031, Yunnan Province, China chenyingjiekm@126.com
  • About author:Wu Bang-guo, Attending physician, Department of Nuclear Medicine, Zhaotong First People’s Hospital, Zhaotong 657000, Yunnan Province, China 54812038@qq.com Zhou Yi-ping, Doctor, Associate professor, Yunnan Key Laboratory of Pharmacology for Natural Products, Kunming Medical University, Kunming 650031, Yunnan Province, China yipingzhou.cn@gmail.com Yan Jia, Studying for master’s degree, Department of Anatomy, Kunming Medical University, Kunming 650031, Yunnan Province, China jiayan.med@gmail.com Wu Bang-guo, Zhou Yi-ping and Yan Jia contributed equally to this paper.
  • Supported by:

    Specific Foundation Program of Yunnan Universities Key Laboratory for Pharmacy (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: Intramedullary nail fixation for long bone fractures is easy to cause bone deformities due to screw breakage. The optical measurement technology used in the biomedical field can be more accurate to analyze the characteristics of screw breakage
OBJECTIVE: To measure the deformation of femoral interlocking intramedullary nail with the digital speckle correlation method.
METHEDS: Four femoral specimens of unknown grown-ups were taken. An intramedullary nail fixation model in the femur 1/2 was made. Four locking nails marked were from top to bottom 1, 2, 3, 4. Groups A, B, C and D were measured in order. Group A: the femur was not sawed with intramedullary nail placed inside the femur shaft marrow (simulation of the cured fracture); group B: the femur was sawed on the basis of A in order to simulating more complicated fracture (fractured twice on the femur 1/2, the center point of femoral shaft was sawed up firstly, the place 5 mm below the center point was sawed up secondly); group C: a nail of the upper end was removed on the basis of B; D: a nail of the lower end was removed on the basis of C; the deformation of the fourth nail in groups A-D was measured. Under 200, 300, 400 N, the related data were carried out to be measured by CSS-44100-electronic universal testing machine, and the deformation was calculated by digital speckle correlation method.
RESULTS AND CONCLUSION: There was a statistical difference between group B and C with 300 N (P < 0.05). The remote nail for femoral interlocking intramedullary nail internal fixation is easily broken.

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