活兔颈椎稳定及椎板修补术的生物力学研究

BIOMECHANICAL RESERCH OF STABILITY OFLlVING RABBIT CERVICAL VERTEBRA AFTERLAMINA RESECTION AND REPAIR

本文在单向拉伸状态下首次进行了活兔颈椎Ｃ３－Ｃ５（颈３－颈５）松弛、蠕变，单向拉伸破坏实验。活体（Ｃ３－Ｃ５）切除ｃ４椎板的相应生物力学实验。Ｃ４椎板切除后用ＭＭＡ／Ｓ加ＭＭＡ（甲基丙烯酸甲酯共聚粉剂加甲基丙烯酸甲酯）修补的相应生物力学实验。根据活体实验，利用三参数模型，求出了活体颈椎（Ｃ３－Ｃ５）松弛模量、蠕变柔量、微分型和积分型本构方程。由实验得出：椎板切除后，颈椎稳定性受到破坏。椎板修补后，稳定性恢复。从而论证了椎板修补术的必要性和可行性。活体实验接近生理，可被临床接受。

Relaxation, creeping and unidirectional tensile tests werc made inliving rabbit cervical vertebra C3-C5.Relevant biomechanical tests werealso made in rabbit after C4 lamina resection with and without MMA/Sand MMA repair. Based on in-vivo tests using 3-components model,relaxation and creeping modules [Y(t),J ( t ) ] were calculated and diff-erential and integral constitutional equations obtained. The results sho-wed that after lamina resection, the stability of cerVical vertebra of ra-bbit was disturbed and the stability recovered after lamina repair, thussuggesing the necessity and feasibility of lamina repair.