中华创伤骨科杂志
中華創傷骨科雜誌
중화창상골과잡지
CHINESE JOURNAL OF ORTHOPAEDIC TRAUMA
2013年
1期
28-31
,共4页
严亚波%裴国献%桑宏勋%马真胜%雷伟
嚴亞波%裴國獻%桑宏勛%馬真勝%雷偉
엄아파%배국헌%상굉훈%마진성%뢰위
骨质疏松%有限元分析%模型,解剖学%生物力学
骨質疏鬆%有限元分析%模型,解剖學%生物力學
골질소송%유한원분석%모형,해부학%생물역학
Osteoporosis%Finite element analysis%Models,anatomic%Biomechanics
目的 建立螺钉-骨抗拔出力试验的动态有限元模型,模拟螺钉的拔出过程. 方法 基于螺钉的国标尺寸,建立直径为6.5 mm的椎弓根螺钉模型,并建立对应骨组织的高密度和低密度多孔泡沫三维模型进行验证,最后建立螺钉-骨模型研究螺钉拔出过程中骨骼的动态响应.在Ansys中对三维模型进行网格划分,并按照美国材料试验协会(ASTM)标准对螺钉进行拔出力加载分析.拔出方向为轴向拔出,拔出速度为0.01 mm/s.建立模型后,对模型进行加载计算并与文献中已发表的结果进行对比,以验证模型的有效性. 结果 在高密度的泡沫组中,本模型的松质骨螺钉拔出力计算值为2028.8 N,在Hashemi等的实验结果[(2132.5±119.3) N]的一个标准差之内.在低密度泡沫组中,本模型的松质骨螺钉拔出力计算值(607.0 N)也在Hashemi等的实验结果[(688.2±91.4) N]的一个标准差之内.模型计算得到的载荷-位移曲线(1.8 mm)与文献报道的结果接近(1.5 mm).从螺钉-骨模型中发现随着螺钉的拔出,螺钉周围受力区域的体积随之变化. 结论 本研究成功建立并验证了螺钉-骨抗拔出力的动态有限元模型,证实本研究建立的模型可以用于椎弓根螺钉拔出力学试验的仿真模拟.
目的 建立螺釘-骨抗拔齣力試驗的動態有限元模型,模擬螺釘的拔齣過程. 方法 基于螺釘的國標呎吋,建立直徑為6.5 mm的椎弓根螺釘模型,併建立對應骨組織的高密度和低密度多孔泡沫三維模型進行驗證,最後建立螺釘-骨模型研究螺釘拔齣過程中骨骼的動態響應.在Ansys中對三維模型進行網格劃分,併按照美國材料試驗協會(ASTM)標準對螺釘進行拔齣力加載分析.拔齣方嚮為軸嚮拔齣,拔齣速度為0.01 mm/s.建立模型後,對模型進行加載計算併與文獻中已髮錶的結果進行對比,以驗證模型的有效性. 結果 在高密度的泡沫組中,本模型的鬆質骨螺釘拔齣力計算值為2028.8 N,在Hashemi等的實驗結果[(2132.5±119.3) N]的一箇標準差之內.在低密度泡沫組中,本模型的鬆質骨螺釘拔齣力計算值(607.0 N)也在Hashemi等的實驗結果[(688.2±91.4) N]的一箇標準差之內.模型計算得到的載荷-位移麯線(1.8 mm)與文獻報道的結果接近(1.5 mm).從螺釘-骨模型中髮現隨著螺釘的拔齣,螺釘週圍受力區域的體積隨之變化. 結論 本研究成功建立併驗證瞭螺釘-骨抗拔齣力的動態有限元模型,證實本研究建立的模型可以用于椎弓根螺釘拔齣力學試驗的倣真模擬.
목적 건립라정-골항발출력시험적동태유한원모형,모의라정적발출과정. 방법 기우라정적국표척촌,건립직경위6.5 mm적추궁근라정모형,병건립대응골조직적고밀도화저밀도다공포말삼유모형진행험증,최후건립라정-골모형연구라정발출과정중골격적동태향응.재Ansys중대삼유모형진행망격화분,병안조미국재료시험협회(ASTM)표준대라정진행발출력가재분석.발출방향위축향발출,발출속도위0.01 mm/s.건립모형후,대모형진행가재계산병여문헌중이발표적결과진행대비,이험증모형적유효성. 결과 재고밀도적포말조중,본모형적송질골라정발출력계산치위2028.8 N,재Hashemi등적실험결과[(2132.5±119.3) N]적일개표준차지내.재저밀도포말조중,본모형적송질골라정발출력계산치(607.0 N)야재Hashemi등적실험결과[(688.2±91.4) N]적일개표준차지내.모형계산득도적재하-위이곡선(1.8 mm)여문헌보도적결과접근(1.5 mm).종라정-골모형중발현수착라정적발출,라정주위수력구역적체적수지변화. 결론 본연구성공건립병험증료라정-골항발출력적동태유한원모형,증실본연구건립적모형가이용우추궁근라정발출역학시험적방진모의.
Objective To establish screw-bone finite element (FE) models for screw pullout simulation.Methods A pedicle screw model with a diameter of 6.5 mm,a model of screw-low density porous foam and a model of screw-high density porous foam were established and validated against the published data.Next,a screw-bone model was established and imported into the ANSYS software for FE simulation to study the dynamic bone responses during screw pullout according to the criteria set by American Association for Testing Materials (ASTM).A velocity loading of 0.01 mm/s with a maximum displacement of 2.7 mm was applied on the screw.For validation,the screw-foam models with 2 different densities were used for comparison of the pullout forces with the experimental data published.Results In validation,the predicted pullout forces were 2028.8 N in the high density foam model and 607.0 N in the low density foam model,respectively.They were in good agreement with the data of Hashemi et al.(2132.5 ± 119.3 N and 688.2 ±91.4 N,respectively).The load-displacement curves in the FE models were similar to the published (1.8 mm versus 1.5mm).In the simulation of screw pullout,the areas around the crew changed in volume in the process of pullout.Conclusion The dynamic screw-bone FE model established and validated by the present study can be used in simulation of pullout of pedicle screws to study mechanical bone responses to the pullout.
