Chinese Journal of Tissue Engineering Research ›› 2010, Vol. 14 ›› Issue (39): 7251-7253.doi: 10.3969/j.issn.1673-8225.2010.39.008

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Biomechanical evaluation of anterior cervical plate fixation combined with intervertebral bone graft for the treatment of Hangman’s fracture

Huang Yang-liang1, Liu Shao-yu1, Zhao Wei-dong2, Li Hao-miao1, Wei Fu-xin1, Chen Ke-bing1　   

  1. 1 Department of Spine Surgery, First Affiliated Hospital, Sun Yat-sen University, Guangzhou  510700, Guangdong Province, China; 2 Laboratory of Biomechanics, Southern Medical University, Guangzhou  510515, Guangdong Province, China　
  • Online:2010-09-24 Published:2010-09-24
  • Contact: Liu Shao-yu, Professor, Doctoral supervisor, Chief physician, Department of Spine Surgery, First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510700, Guangdong Province, China gzsyliu@tom.com
  • About author:Huang Yang-liang★, Master, Physician, Department of Spine Surgery, First Affiliated Hospital, Sun Yat-sen University, Guangzhou 510700, Guangdong Province, China lansedeahi@yahoo.com.cn
  • Supported by:

     the Science and Technology Planning Project of Guangdong Province, No. 2008B030301303*; the Science and Technology Planning Project of Huangpu Area, No. 0931*

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Abstract:

BACKGROUND: C 2/3 discectomy, intervertebral autograft combined with plate fixation were commonly seen in surgical treatment of Hangman’s fracture. This method was used widely in clinical practice, however, the investigation of its biomechanical feature was not sufficient.
OBJECTIVE: To evaluate the biomechanical stabilities of intervertebral autograft combined with plate fixation in treatment of type Ⅱ Hangman’s fracture.
METHODS: Totally 6 fresh frozen human spine specimens were used, each of them was made into 3 conditions: intact condition (blank control group), type Ⅱ Hangman’s fracture condition (Hangman group) and plate fixation condition (plate fixation group). On above sequences, three-dimensional laser scanner and three-dimensional motion testing machine were used to test range of motion (ROM) of C 2/3 segment under each condition.
RESULTS AND CONCLUSION: Compare with the blank control group, ROM of joint of the Hangman group was significantly larger on flexion, extension, axial rotation and lateral bending (P < 0.05); ROM of joint of the plate fixation group was significantly larger on direction of axial rotation (P < 0.05). Compare with Hangman group, ROM of joint of plate fixation group was significant smaller on direction of flexion, extension and lateral bending (P < 0.05). The results indicated that in treatment of type Ⅱ hangman’s fracture, plate fixation is helpful in resuming stability on direction of flexion, extension and lateral bending, however, stability can not be achieved on direction of axial rotation, therefore, postoperative external fixation is recommended to secure fusion.

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