于滨生,曾丽雯,李泽民,周治宇,王丽冰.髂骨垫片对髂骨螺钉疲劳载荷后下沉位移的影响[J].中国脊柱脊髓杂志,2011,(7):588-591. |
髂骨垫片对髂骨螺钉疲劳载荷后下沉位移的影响 |
中文关键词: 脊柱-骨盆固定 髂骨螺钉 髂骨垫片 生物力学 |
中文摘要: |
【摘要】 目的:评价自主设计的髂骨垫片对髂骨螺钉疲劳载荷后下沉位移的影响。方法:6具成人新鲜尸体腰椎-骨盆标本用于实验。经双能X线吸收法测定L1~L4平均骨密度后,随机将髂骨垫片放置在一侧髂骨进钉点处(A组),另一侧无垫片作为对照(B组)。将直径7.5mm、长度70mm的髂骨螺钉分别置入左右侧髂骨,在MTS材料实验机上,向螺钉尾部施加100~400N垂直循环载荷20000次,记录每5000次载荷后两侧髂骨螺钉的下沉位移并比较。结果:6具标本的腰椎骨密度为0.78~1.06g/cm2,平均0.89±0.06g/cm2。所有螺钉顺利承受20000次的垂直载荷。在第5000、10000、15000和20000次轴向压缩载荷点上,A组髂骨螺钉的下沉位移分别为0.28mm、0.36mm、0.48mm和0.66mm;B组髂骨螺钉的下沉位移分别为0.34mm、0.69mm、0.88mm和1.07mm。在第5000次载荷点上,A组和B组螺钉下沉位移的差异无显著性(P>0.05);在第10000、15000和20000次载荷点上,A组与B组螺钉下沉位移的差异均有显著性(P<0.05)。20000次载荷后X线片发现A组无螺钉松动,B组5枚螺钉松动。结论:髂骨垫片可有效减少髂骨螺钉疲劳载荷后的下沉位移,防止髂骨螺钉松动。 |
Effect of an iliac bone plate on the subsidence of iliac screw after fatigue loading |
英文关键词:Spino-pelvic reconstruction Iliac screw Iliac bone plate Biomechanics |
英文摘要: |
【Abstract】 Objective:To evaluate the biomechanical effect of a self-designed iliac bone plate on the subsidence of iliac screw after fatigue loading.Method:Lumbo-pelvic specimens from 6 adult fresh cadavers were used in this study,their mean bone mineral densities(BMD) of L1-L4 were measured by using dual-energy radiograph absorptiometry.The iliac bone plate was randomly placed at the iliac screw entry point of one-side ilium(group A),while the other side without iliac bone plate served as the control(group B).Then,the iliac screws with 70mm length and 7.5mm diameter were inserted into the ilium bilaterally.On a MTS testing machine,a dynamic compressive loading of 100-400N was added to the screw head for 20000 cycles.The screw subsidence displacements following each 5000 cyclic loadings were measured and compared between two groups.Result:The average BMD value of 6 specimens was 0.89±0.06g/cm2,ranged from 0.78g/cm2 to 1.06g/cm2.All the screws passed the 20000 cyclic loadings smoothly.At the time-points of the 5000th,10000th,15000th,and 20000th cyclic loadings,the subsidence displacements of iliac screw in group A were 0.28mm,0.36mm,0.48mm and 0.66mm respectively;while those in group B were 0.34mm,0.69mm,0.88mm and 1.07mm respectively.After the first 5000 cyclic loadings,no significance with respect to subsidence displacement was detected between two groups(P>0.05).However,at the 10000th,15000th and 20000th cycles,significant difference was noted between two groups(P<0.05).After the 20000 cyclic loadings,no screw in group A and 5 screws in group B were found loosen under radiograph.Conclusion:The iliac bone plate can effectively resist the subsidence of iliac screw following fatigue loading and protect iliac screw against loosening. |
投稿时间:2011-03-28 修订日期:2011-05-07 |
DOI:10.3969/j.issn.1004-406X.2011.7.588.3 |
基金项目:基金项目:广东省科技计划项目(编号:2008B050100012,2009B050700023) |
|
摘要点击次数: 4112 |
全文下载次数: 2090 |
查看全文 查看/发表评论 下载PDF阅读器 |
关闭 |