中华小儿外科杂志
中華小兒外科雜誌
중화소인외과잡지
CHINESE JOURNAL OF PEDIATRIC SURGERY
2010年
6期
435-439
,共5页
李新锋%刘祖德%戴力扬%胡光宇%汪正宇%钟贵彬%臧危平
李新鋒%劉祖德%戴力颺%鬍光宇%汪正宇%鐘貴彬%臧危平
리신봉%류조덕%대력양%호광우%왕정우%종귀빈%장위평
脊柱侧弯%有限元分析%生物力学
脊柱側彎%有限元分析%生物力學
척주측만%유한원분석%생물역학
Scoliosis%Finite element analysis%Biomechanics
目的 研究脊柱侧弯轴向负载后椎体、椎间盘、关节突关节和终板等结构的力学响应特征,胸段侧弯畸形对腰椎应力分布的影响.方法 采用已经建立的单胸弯特发性脊柱侧弯的三维有限元模型,通过设置边界条件和载荷后,进行轴向负载模拟计算,最后读取并分析脊柱侧弯不同部位和结构的应力分析结果 .结果 特发性脊柱侧弯轴向负载后胸椎畸形部位应力明显高于脊柱其他部位,且应力集中于凹侧.胸椎和腰椎两侧椎间盘、终板和骨质的应力均呈现明显的不平衡,椎间盘应力主要集中于胸段结构性主弯凹侧纤维环的后外侧区域.关节突关节是轴向负载的主要承担者,胸主弯凹侧的L5-S1关节突关节应力最大.结论 单胸弯脊柱侧弯可导致整个脊柱的椎间盘、关节突关节和终板等结构应力不均匀分布,这种力学响应特征和畸形进展密切相关.长期应力的不对称性分布可以改变椎间盘、终板和椎体骨质内的细胞活动,使特发性脊柱患儿容易更早地出现相关性疾病.
目的 研究脊柱側彎軸嚮負載後椎體、椎間盤、關節突關節和終闆等結構的力學響應特徵,胸段側彎畸形對腰椎應力分佈的影響.方法 採用已經建立的單胸彎特髮性脊柱側彎的三維有限元模型,通過設置邊界條件和載荷後,進行軸嚮負載模擬計算,最後讀取併分析脊柱側彎不同部位和結構的應力分析結果 .結果 特髮性脊柱側彎軸嚮負載後胸椎畸形部位應力明顯高于脊柱其他部位,且應力集中于凹側.胸椎和腰椎兩側椎間盤、終闆和骨質的應力均呈現明顯的不平衡,椎間盤應力主要集中于胸段結構性主彎凹側纖維環的後外側區域.關節突關節是軸嚮負載的主要承擔者,胸主彎凹側的L5-S1關節突關節應力最大.結論 單胸彎脊柱側彎可導緻整箇脊柱的椎間盤、關節突關節和終闆等結構應力不均勻分佈,這種力學響應特徵和畸形進展密切相關.長期應力的不對稱性分佈可以改變椎間盤、終闆和椎體骨質內的細胞活動,使特髮性脊柱患兒容易更早地齣現相關性疾病.
목적 연구척주측만축향부재후추체、추간반、관절돌관절화종판등결구적역학향응특정,흉단측만기형대요추응력분포적영향.방법 채용이경건립적단흉만특발성척주측만적삼유유한원모형,통과설치변계조건화재하후,진행축향부재모의계산,최후독취병분석척주측만불동부위화결구적응력분석결과 .결과 특발성척주측만축향부재후흉추기형부위응력명현고우척주기타부위,차응력집중우요측.흉추화요추량측추간반、종판화골질적응력균정현명현적불평형,추간반응력주요집중우흉단결구성주만요측섬유배적후외측구역.관절돌관절시축향부재적주요승담자,흉주만요측적L5-S1관절돌관절응력최대.결론 단흉만척주측만가도치정개척주적추간반、관절돌관절화종판등결구응력불균균분포,저충역학향응특정화기형진전밀절상관.장기응력적불대칭성분포가이개변추간반、종판화추체골질내적세포활동,사특발성척주환인용역경조지출현상관성질병.
Objective To investigate the mechanical response of the vertebral body, disc, zygapophysial joint, endplate of adolescent idiopathic scoliosis under axial load condition. To study the effect of thoracic scoliosis on the stress distribution of lumbar spine. Methods Three dimensional finite element model of adolescent idiopathic scoliosis was built and imported into the ANSYS software for assigning boundary and loading conditions. The axial loading condition was simulated after entering the .solution modular. The stress results of the different parts and structures of the scoliotic spine were collected and analyzed. Results The stress of the scoliotic site located at the thoracic spine was higher than the other site,especially at the concave site. Scoliosis could result the asymmetric distribution of the stress on the disc, endplate, and zygapophysial joint of the thoracic spine and the lumbar spine.High localized stress was detected at the posterolateral portion of the annulus fibrosus on the concave side of the thoracic major curve. The zygapophysial joint was the main bearer under axial loading condition. The maximum stress occurred at the zygapophysial joint of L5-S1 vertebrae on the concave side of the thoracic major curve. Conclusions Scoliosis can lead to the unbalanced stress distribution of the vertebral body, intervertebral disc, endplate and zygapophysial joint, which is related to the progression of the scoliotic spine. Long term asyrmmetric loading condition may affect the cell activity of the disc,endplate and vertebral body. This may result the associated disease occur earlier in such group.