[Biomechanics research of thoracolumbar vertebral burst fracture in impact damage].
OBJECTIVE
To investigate the damage characteristics and biomechanical mechanisms of the thoracolumbar vertebral bursh fracture during the impact loading.


METHODS
From September 2008 to October 2009, 10 fresh human thoracolumbar spine specimens were collected for experimental model and divided into two groups. Biomechanical static and dynamic impact strength test were performed respectively in two groups. The static and dynamic data from thoracolumbar vertebrae shock response in different loads were observated.


RESULTS
Thoracolumbar yield load was (5 280.00 +/- 354.2) N, yield displacement was (13.32 +/- 2.07) mm, the limit load was(6 590.00 +/- 249.20) N, ultimate displacement was (20.60 +/- 2.57) mm, load speed was 0.02 g, and the average limit load of dynamic mechanical properties of thoracic and lumbar vertebrae was (14 425.60 +/- 1101.52) N, the average reaction time load was (17.29 +/- 2.04) ms, the average of acceleration was (36.80 +/- 2.81) g, the dynamic displacement was (45.11 +/- 1.13) mm.


CONCLUSIONS
Thoracolumbar vertebral burst fracture is a serious injury caused by the release of high-energy moment, the role of biomechanical forces are in a pattern of pulse change, thoracic and lumbar vertebrae present with the viscoelastic properties of biological materials.
The Affiliated Xiaoshan People's Hospital of Medical College of Hangzhou Normal University, Hangzhou 311200, Zhejiang, China. david1125hz@yahoo.com.cn
Da-Wei
DW
Bi
Wei
W
Wang
Jun
J
Fei
Gang
G
Zu
Yi-Min
YM
Cheng
Wei
W
Wu
D001696:Biomechanical Phenomena; D002102:Cadaver; D006801:Humans; D008159:Lumbar Vertebrae / Q000293:injuries*; D016103:Spinal Fractures / Q000378:metabolism* / Q000503:physiopathology; D013314:Stress, Mechanical; D013904:Thoracic Vertebrae / Q000293:injuries*