Orion钢板固定后对植骨块及小关节突应力影响的实验研究

目的:研究单纯植骨及植骨+Orion钢板内固定后对植骨块及相邻椎节小关节突应力的影响。方法:采用8具男性新鲜颈椎标本,分别行单纯植骨及植骨+Orion钢板内固定后测量植骨块及相邻椎节小关节突应力的变化。结果:单纯植骨时融合节段上小关节突的应力无明显增加,而植骨+Orion钢板内固定后则显著增加。单纯植骨及植骨+Orion钢板内固定后融合节段下小关节突的应力无明显增加。植骨+Orion钢板内固定后植骨块的应力较单纯植骨时变小。结论:植骨+Orion钢板内固定后融合节段上小关节突的应力明显增加,容易造成融合上节段的退变,并且存在一定的应力遮挡,故在治疗单纯颈椎退行性病变的患者时,使用Orion钢板内固定应持谨慎态度。

Cervical Spine Orion Plate for Unstable Cervical Spine: A Biomechanical in Vitor

Objective: To research stability of cervical spine and facet joint and auto-iliac graft's stress on the condition of auto-iliac graft and auto-iliac graft + Orion plate in 3 poles instability. Methods:To measure 8 cervical spine specimens(C2-7) scope of dimensional movements and variety of stress on 4 conditions:normal,damnification,auto-iliac graft,auto-iliac graft + O-rion plate. Results: When auto-iliac graft,auto-iliac graft + Orion plate,comparing to the normal condition, the scope of its movements decrease remarkably (P<0.05). Stress of the upper facet join and the lower facet joint increase at the same time, the upper one will be notable. There is notable distinction between auto-iliac graft and auto-iliac graft + Orion plate. Conclusion: Orion plates can improve its stability and make recover, which plays the main role in the process of fusion of bone graft, But Orion plates may accelerate facet joint degeneration,so when treating cervical degeneration, we should consider it.