Chinese Journal of Tissue Engineering Research ›› 2011, Vol. 15 ›› Issue (26): 4798-4803.doi: 10.3969/j.issn.1673-8225.2011.26.013

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Feasibility of adult cervical pedicle screw in the lumbar spine of young children

Li Xian-ling1, Zhang Qin-ming1, Li Xian-jin2, Zhang Xue-jun1, Li Cheng-xin1, Sun Lin1, Lu Shou-yan3, Zhang Kun-ya4, Yu Feng-zhang1, Qi Xin-yu1, Sun Bao-sheng1   

  1. 1Department of Orthopedics, Beijing Children’s Hospital, Capital Medical University, Beijing  100045, China
    2Institute of Mechanics, Chinese Academy of Sciences, Beijing  100190, China
    3Beijing Zhongguancun Hospital, Beijing  100090, China
    4Biomechanics Laboratory, College of Bioengineering, Capital Medical University, Beijing  100069, China
  • Received:2011-02-12 Revised:2011-03-16 Online:2011-06-25 Published:2011-06-25
  • Contact: Zhang Xue-jun, Chief physician, Department of Orthopedics, Beijing Children’s Hospital, Capital Medical University, Beijing 100045, China zhang-X-J04@163.com Correspondence to: Zhang Qin-ming, Department of Orthopedics, Beijing Children’s Hospital, Capital Medical University, Beijing 100045, China
  • About author:Li Xian-ling★, Master, Physician, Department of Orthopedics, Beijing Children’s Hospital, Capital Medical University, Beijing 100045, China lixianling20002000@yahoo.com.cn
  • Supported by:

    Beijing Personal Project for Excellent Talents Culture, No. 20081B0300800085*

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Abstract:

BACKGROUND: Because the vertebrae of children aged 1 to 3 years are not fully mature, there is no specific pedicle screw for children. At present, the existing pedicle screw with the smallest diameter is for adult cervical lateral mass or pedicle screw fixation.
OBJECTIVE: To compare the biomechanical changes of adult cervical pedicle screw used in cervical pedicle fixation of adult pigs and lumbar pedicle fixation of young pigs.
METHODS: C3-6 segments for six fresh adult pigs and lumbar spinal specimens from six 8-week-old young pigs were selected to prepare 54 single vertebrae with 108 pedicles. Adult cervical pedicle screw was placed into the prepared pedicles, and the maximum axial pull-out strength was detected using biomechanical methods.
RESULTS AND CONCLUSION: The maximum axial pull-out strength of the cervical specimen was lower than that of the lumbar specimen, but there was no significant difference (P > 0.05). The mean pull-out strength of L1 was significantly lower than that of L3 (P < 0.05). The mean pull-out strength of C5 was significantly higher than that of C3 (P < 0.05). There was a significant difference between the bone marrow density of the cervical and lumbar specimens (P < 0.01). From this study, we got the preliminary experimental foundation about applying adult cervical pedicle screw to the lumbar spine of young children from the viewpoint of axial pull-out strength.

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