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颈椎内固定对相邻节段椎间盘及椎间关节应力影响的生物力学研究 被引量:9

Biomechanical study on the stress effect of adjacent-level intervertebral disk and intervertebral joint after cervical spine instrumentation
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摘要 目的探讨颈椎间植骨内固定相邻节段退变的生物力学机制。方法 5具成人尸体颈椎(C2~T1)标本用于试验。固定T1,施加作用力于C2,实验按顺序分为A、B1、C1、D1、B2、C2、D2 7组,测试各组在前屈、后伸两种状态下相邻节段C3~4椎间盘、椎间关节应力。结果各组相邻节段椎间盘、椎间关节应力随固定强度和节段增加而增加,即D2组>C2组>B2组>A组、D2组>D1组、C2组>C1组、B2组>B1组,其中C2、D2两组与A组、C2组与B2组、D2组与C2组、D2组与D1组、C2组与C1组比较差异均有统计学意义(P<0.05)。结论颈椎间植骨内固定后相邻节段椎间盘、椎间关节应力增加;固定强度及节段越大影响越大。 Objective To explore the biomechanical mechanism of adjacent-segment degeneration after cervical spine fusion and instrumentation.Methods Five adult cervical spine specimens of cadaver(C2~T1)were tested.Specimens were stabilized at T1 and loaded at C2 and the test was distributed seven groups in order that were A,B1,C1,D1,B2,C2,D2.The stress of intervertebral disk and intervertebral joint at C3~4 of all group were measured during flexion and extension.Results The stiffer and longer of cervical spine were fixed,the more stress of intervertebral disk and intervertebral joint in adjacent segment increased(D2C2B2A,D2D1,C2C1,B2B1).Comparing with group A,the stress at group C2 and D2 increased significantly.When C2 comparing with B2 and D2 comparing with C2 and D2 comparing with D1 and C2 comparing with C1,they all had significant difference(P0.05).Conclusions The stress of intervertebral disk and intervertebral joint in adjacent segment increases after cervical spine fusion and instrumentation.The stiffer and longer of cervical spine are fixed,the more stress of intervertebral disk and intervertebral joint in adjacent segment increases.
出处 《临床骨科杂志》 2010年第4期454-456,共3页 Journal of Clinical Orthopaedics
关键词 颈椎 相邻节段 生物力学 内固定 椎间盘 cervical vertebrae adjacent-segment biomechanics instrumentation intervertebral disk
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