Chinese Journal of Tissue Engineering Research ›› 2010, Vol. 14 ›› Issue (43): 8016-8018.doi: 10.3969/j.issn.1673-8225.2010.43.010

Previous Articles     Next Articles

Displacement of steel plate of femoral fractures under 100 and 400 N loading: Measurement by using digital speckle method

Ba Ying-chun1, Chen Ying-jie1, Fan Yan1, Wang Jin-de1, Zhou Yi-ping2　   

  1. 1 Department of Anatomy, Kunming Medical College, Kunming  650031, Yunnan Province, China; 2 Yunnan Key Laboratory of Pharmacology for Natural Products, Kunming Medical College, Kunming  650031, Yunnan Province, China
  • Online:2010-10-22 Published:2010-10-22
  • Contact: Zhou Yi-ping, Doctor, Lecturer, Yunnan Key Laboratory of Pharmacology for Natural Products, Kunming Medical College, Kunming 650031, Yunnan Province, China yipingzhou.cn@gmail.com
  • About author:Ba Ying-chun, Associate professor, Department of Anatomy, Kunming Medical College, Kunming 650031, Yunnan Province, China byc71206@yahoo.com.cn Ba Ying-chun and Chen Ying-jie equally contributed to this article.

PDF

307

Abstract:

BACKGROUND: Plate internal fixation is frequently used to treat long-bone fracture. However, screw breakage-induced bone deformity occurs. Optical measurement can accurately analyze features of screw breakage.
OBJECTIVE: To measure the displacement of femoral steel plate screw by the digital speckle method.
METHODS: A total of 6 femoral specimens were used, and femoral middle segment fracture was made by sawing at 1/2 of shaft of femur. The fracture sample was reduced, and fixed using 10-well plate with 5 screws at each end. Two 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.
RESULTS AND CONCLUSION: There was significant difference in stress among screw 1-10 under 100 and 400 N tensile force (F=108.326, P < 0.01; F=151.258, P < 0.01). Pair-comparison showed no significance between screw 1 and 10, 2 and 9, 3 and 8, 4 and 7, 5 and 6 (P > 0.05), and the stress among any other two screws were significant (P < 0.05). The screws at two ends of fracture line bear more stress, and could break. All screws fixed should cause the load equalization as far as possible in a straight line.

CLC Number: