中华实验外科杂志
中華實驗外科雜誌
중화실험외과잡지
CHINESE JOURNAL OF EXPERIMENTAL SURGERY
2013年
10期
2175-2177
,共3页
髋臼骨折%有限元%内固定%生物力学
髖臼骨摺%有限元%內固定%生物力學
관구골절%유한원%내고정%생물역학
Acetabular fracture%Finite element%Internal fixation%Biomechanics
目的 探讨髋臼双柱骨折经前路内固定术后早期站位的安全性.方法 选择1例成年健康男性志愿者CT扫描,Mimics8.1重建半骨盆有限元模型,经网格划分及附值后构建前路特殊塑形钛板加方形区螺钉固定髋臼双柱骨折的半骨盆有限模型,模拟单足站位加载500 N轴向载荷,分析各部位应力及位移情况.结果 骨折经内固定后应力分布均匀,应力集中出现在钛板与螺钉结合处,最大应力为838 MPa,小于材料屈服强度；近端第1枚方形区螺钉承担应力较大,方形区螺钉跨方形骨折线处和前柱髂骨翼处短钛板近骨折线处出现了应力集中区域；后柱位移最大值为0.124 mm.结论 双柱骨折经前路特殊塑形钛板加方形区螺钉内固定后,早期生理负荷站位并不影响内固定的可靠性.
目的 探討髖臼雙柱骨摺經前路內固定術後早期站位的安全性.方法 選擇1例成年健康男性誌願者CT掃描,Mimics8.1重建半骨盆有限元模型,經網格劃分及附值後構建前路特殊塑形鈦闆加方形區螺釘固定髖臼雙柱骨摺的半骨盆有限模型,模擬單足站位加載500 N軸嚮載荷,分析各部位應力及位移情況.結果 骨摺經內固定後應力分佈均勻,應力集中齣現在鈦闆與螺釘結閤處,最大應力為838 MPa,小于材料屈服彊度；近耑第1枚方形區螺釘承擔應力較大,方形區螺釘跨方形骨摺線處和前柱髂骨翼處短鈦闆近骨摺線處齣現瞭應力集中區域；後柱位移最大值為0.124 mm.結論 雙柱骨摺經前路特殊塑形鈦闆加方形區螺釘內固定後,早期生理負荷站位併不影響內固定的可靠性.
목적 탐토관구쌍주골절경전로내고정술후조기참위적안전성.방법 선택1례성년건강남성지원자CT소묘,Mimics8.1중건반골분유한원모형,경망격화분급부치후구건전로특수소형태판가방형구라정고정관구쌍주골절적반골분유한모형,모의단족참위가재500 N축향재하,분석각부위응력급위이정황.결과 골절경내고정후응력분포균균,응력집중출현재태판여라정결합처,최대응력위838 MPa,소우재료굴복강도；근단제1매방형구라정승담응력교대,방형구라정과방형골절선처화전주가골익처단태판근골절선처출현료응력집중구역；후주위이최대치위0.124 mm.결론 쌍주골절경전로특수소형태판가방형구라정내고정후,조기생리부하참위병불영향내고정적가고성.
Objective To explore reliability of early standing postion after anterior fixation in both-column acetabular fracture.Methods One healthy adult male volunteer was chosen to take CT scanning.Hemipelvis three dimensional model was reconstructed by Mimics8.1.Fix fractures of both-column acetabular by anterior specially-shaped reconstruction plate combined with trans-plate quadrilateral screws after remeshing and parameters setting.The characteristics of the stress and displacement in model were analyzed under 500 N axial load imitating uniped standing position.Results The stress of fracture model fixed by the anterior internal fixation was well distributed,but the stress concentration happened at junction of screw and plate.The maximum stress value was 838 MPa,which was lower than yield strength of the titanium material.The first proximal trans-plate quadrilateral screw beared the larger stress than the others.One stress concentration zone appeared in trans-plate quadrilateral screws across square area of the fracture line,and the another one in short titanium plate across the anterior iliac wing fracture line.The maximum displacement of the posterior column was 0.124 mm.Conclusion Early standing postion could not influence the dependability of both-column acetabular fracture fixed by anterior specially-shaped reconstruction plate combined with trans-plate quadrilateral screws in physiological load.
