人工椎体植入位置的生物力学研究  被引量:3

Biomechanical study of artificial vertebral body in different implantation positions

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作  者:王新伟[1] 赵定麟[1] 陈德玉[1] 袁文[1] 王以进[2] 

机构地区:[1]第二军医大学附属长征医院骨科,上海200003 [2]上海大学生物力学研究室

出  处:《中华创伤杂志》2004年第2期93-96,共4页Chinese Journal of Trauma

基  金:上海市科学技术委员会资助项目 (0 2 44 1912 6)

摘  要:目的 研究人工椎体不同植入位置对腰椎生物力学性能的影响。 方法 小牛腰椎标本 6具 ,按中间区、前区、后区、侧方区及斜向分别植入人工椎体 ,测试原始标本及不同植入位置时屈曲、伸展、左、右侧屈等工况下载荷 -应变关系及应力强度。 结果 与中间区植入相比 ,屈曲、伸展、左右侧屈 4种状态下人工椎体斜向及侧方植入时 ,应变增大 ,且差异有显著性意义 (P<0 .0 5 ) ,前区及后区植入差异无显著性意义 (P >0 .0 5 )。不同植入位置人工椎体上的应力强度均大于原始标本 ,后区植入屈曲、伸展应力强度最高 ,为原始标本的 1.5~ 1.9倍。与中间区相比 ,人工椎体斜放或侧方放置时 ,胸腰椎强度明显下降 (P <0 .0 5 ) ;前区或中间区植入时 ,胸腰椎强度并无明显下降 (P >0 .0 5 ) ,相反在某些状态如屈曲或伸展时会有所增高。 结论 斜向植入人工椎体对椎体的应变及应力强度影响最为明显 ,其次为侧区放置 ,后区、中间区及前区放置时椎体应变及强度变化不大。尽管人工椎体不同位置时椎体应力强度均大于原始标本 ,但以后区及中间区放置最为理想 ,应尽量避免斜放及偏于椎体一侧放置。Objective To investigate the effect of different implantation positions of artificial vertebral body implants on lumbar biomechanics. Methods Six vertebral body of bovine lumbar spine were implanted in artificial vertebral body (AVB) in different implantation positions, ie, neutral, anterior, posterior, lateral and oblique positions. The load-strain and the strength were tested under four states, ie, flexion, extension, left and right lateral bending. Results The strain in oblique and lateral implantations under flexion, extension, and left and right bending was significantly greater than that of the neutral implantation position (P<0.05). However, there was no significant difference between anterior and posterior positions and neutral position (P>0.05). The strength in different implantation positions of AVB was significantly greater than that of the intact vertebrae. The bending and flexion stress of the posterior implantation was the greatest, 1.5-1.9 times of the intact vertebrae. Compared with the neutral implantation, the strength of the oblique and lateral positions decreased significantly (P<0.05). While there was no significant decrease in the strength when the anterior or neutral implantations were performed (P>0.05). Nevertheless, the strength would increase under bending or flexion. Conclusions The stress and the strength of the oblique implantation on the vertebrae are the most significant, those of the lateral implantation places the second and those of the anterior, posterior and neutral positions the least. The posterior and neutral positions are ideal although the stress of AVB in different implantation positions is stronger than that of the intact vertebrae. The oblique and lateral implantation should be avoided according to the biomechanics.

关 键 词:人工椎体 生物力学 脊柱内固定技术 应力强度 

分 类 号:R687.3[医药卫生—骨科学]

 

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