Chinese Journal of Tissue Engineering Research ›› 2011, Vol. 15 ›› Issue (26): 4931-4935.doi: 10.3969/j.issn.1673-8225.2011.26.045

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Load-strain-displacement of three patterns of dual-plate fixation for intercondylar fracture of the humerus

Cai Hao1, Ni Xiao-hui2, Dong E-liang3, Sheng Guo-qing1, Qin Yu-xing1, Wang You-hua2   

  1. 1Department of Orthopedics, Danyang Hospital of Traditional Chinese Medicine, Zhenjiang 212300, Jiangsu Province, China
    2Department of Orthopedics, Affiliated Hospital of Nantong University, Nantong  226001, Jiangsu Province, China
    3Institute of Mechanics, Southeast University, Nanjing  211100, Jiangsu Province, China
  • Received:2011-02-17 Revised:2011-04-17 Online:2011-06-25 Published:2011-06-25
  • Contact: Wang You-hua, Master, Chief physician, Professor, Department of Orthopedics, Affiliated Hospital of Nantong University, Nantong 226001, Jiangsu Province, China wangyouhuant@yahoo.com.cn
  • About author:Cai Hao★, Master, Associate chief physician, Department of Orthopedics, Danyang Hospital of Traditional Chinese Medicine, Zhenjiang 212300, Jiangsu Province, China www.caihao06170228@126.com
  • Supported by:

    a grant from the Medical Talent of “Hygiene Project through Science and Education” of Jiangsu Province, No. RC2007087*

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Abstract:

BACKGROUND: Dual-plate has been regarded as an ideal clinical therapy for intercondylar fracture of the humerus. However, the placement pattern remains controversial.
OBJECTIVE: To compare biomechanical characteristics of three placement patterns of dual-plate internal fixation for intercondylar fracture of the humerus.
METHODS: A total of 18 anticorrosive cadaveric adult humerus specimens were used to prepare “T” style intercondylar fracture of the humerus. Two strain gauges were stuck at each side of the fracture line. The fracture was treated by dorsal-plate, perpendicular-plate, and parallel-plate fixation. Biomechanical tests were performed on these specimens, including strain, displacement, and rigidity.
RESULTS AND CONCLUSION: Data of the stress and displacement showed that there was no significant difference in displacement among three different internal fixation methods under stress bellow 500 N. The displacement of parallel-plate group was less than dorsal-plate and perpendicular-plate groups under stress of 500 N (P < 0.05). The strain was significantly less in parallel-plate group compared with dorsal-plate and perpendicular-plate groups (P < 0.05). The strain of internal and external condyle was greater than intercondylar strain, and the strain of external condyle was the largest. There were no significant differences in rigidity among three groups under stress less than 300 N. The axial compressive rigidity was largest in parallel-plate group under stress of 300-500 N compared with the other groups (P < 0.05). Under the same load condition, parallel-plate yielded the best results, and there was no obvious difference between dorsal-plate and perpendicular-plate. 

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