胸腰椎二柱和三柱损伤短节段固定的稳定性比较

Abstract

Abstract:

Objective　To compare biomechanical stability of 2-column and 3-column thoracolumbar injury after short segmental fixation. Methods Eight fresh frozen porcine thoracolumbar spine specimens (T13-L5) were collected, and divided to four groups: intact group (A), injury group(B), 2-column injury fixation group(C), and 3-column injury fixation group(D). The stability of four groups at flexion, extension, lateral bending and axial rotation were measured respectively. Two-column injury model was created using dropping technique. For three-column injury model, The excision of supra-spinous ligament, inter-spinous ligament, ligamenta flava and zygapophysial joint was performed on the basis of two-column injury. Results The ROMs of group D at extension, lateral bending and rotation directions were signifcantly increased compared to that of group C (P<0.05), as well ROM of group D at axial rotation increased signifcantly compared to that of group A (P<0.05). The ROMs of group B at all directions increased significantly compared to group A (P<0.05), and ROM of group C decreased significantly compared to group B (P<0.05). The compression stiffness of group D decreased significantly compared to group C (P<0.05), and that of group C decreased significantly compared to group B (P<0.05). The compression stiffness of group D had no difference compared to group B (P>0.05). Conclusions Compare to the three-column injury, the short-segment fixation is more suitable for keeping mechanic stability of the 2-column injury of thoracolumbar level.

Key words: Two-column injury, Three-column injury, Biomechanics, Stability, Compressive Stiffness

CLC Number:

R318.01

YANG Yong, JU Lin, JIANG Jian-Meng, DIAO Wei-Dong, JI Dong-Bin. Biomechanic comparison of 2-column and 3-column thoracolumbar injury after short segmental fixation[J]. Chinese Journal Of Clinical Anatomy, 2012, 30(2): 225-228.

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Biomechanic comparison of 2-column and 3-column thoracolumbar injury after short segmental fixation

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