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[1]方斌,何偉,展磊,等.不同壞死范圍下股骨頭壞死區(qū)應(yīng)力分布的有限元分析[J].中醫(yī)正骨,2012,24(10):10-15.
　FANG Bin*,HE Wei,ZHAN Lei,et al.Finite element analysis of stress distribution over femoral head necrosis zones in different necrosis areas[J].The Journal of Traditional Chinese Orthopedics and Traumatology,2012,24(10):10-15.
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不同壞死范圍下股骨頭壞死區(qū)應(yīng)力分布的有限元分析()
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《中醫(yī)正骨》[ISSN:1001-6015/CN:41-1162/R]

卷:
第24卷
期數(shù):
2012年10期
頁碼:
10-15
欄目:
基礎(chǔ)研究
出版日期:
2012-10-20

文章信息/Info

Title:
Finite element analysis of stress distribution over femoral head necrosis zones in different necrosis areas
作者:
方斌1; 何偉1; 展磊2; 張慶文1; 魏秋實(shí)3; 陳鎮(zhèn)秋1; 陳鵬1; 張美超4
1.廣州中醫(yī)藥大學(xué)第一附屬醫(yī)院,廣東 廣州 510407;
2.廣東藥學(xué)院附屬新市醫(yī)院, 廣東 廣州 510410;
3.廣州軍區(qū)廣州總醫(yī)院,廣東 廣州 510010;
4.南方醫(yī)科大學(xué),廣東 廣州 510515
Author(s):
FANG Bin*; HE Wei; ZHAN Lei; ZHANG Qing-wen; WEI Qiu-shi; CHEN Zhen-qiu; CHEN Peng; ZHANG Mei-chao.
*The First Affiliated Hospital of Guangzhou University of Traditional Chinese Medicine,Guangzhou 510407,Guangdong,China
關(guān)鍵詞:
股骨頭壞死 壞死范圍 應(yīng)力分布 塌陷 有限元分析
Keywords:
Femur head necrosis;  Necrosis area;  Stress distribution;  Collapse;  Finite element analysis
摘要:
目的:探討股骨頭壞死范圍對(duì)壞死區(qū)應(yīng)力分布的影響。方法:采用中國虛擬人男1號(hào)數(shù)據(jù)集,利用Mimics軟件分別建立壞死組織體積分?jǐn)?shù)為30%、50%和60%的股骨頭壞死有限元模型,并利用Ansys軟件進(jìn)行分析。對(duì)上述股骨頭壞死模型分別施以1 440 N、2 400 N、4 200 N載荷,根據(jù)不同載荷及壞死范圍,共設(shè)置9個(gè)股骨頭壞死模型,分別測(cè)定壞死區(qū)表面和底部的應(yīng)力分布情況、應(yīng)力峰值,并分析股骨頭塌陷的可能性。結(jié)果:①股骨頭壞死區(qū)表面應(yīng)力分布情況。相同壞死范圍下,股骨頭在不同載荷作用下,壞死區(qū)表面應(yīng)力分布基本一致,載荷越大,相應(yīng)區(qū)域的應(yīng)力值越大; 壞死組織體積分?jǐn)?shù)為30%時(shí),應(yīng)力分布越接近活骨組織其應(yīng)力值越大,表面峰值應(yīng)力區(qū)位于死骨與活骨交界邊緣的外后方; 壞死組織體積分?jǐn)?shù)為50%、60%時(shí),股骨頭壞死表面范圍超過了股骨頭承重面,二者應(yīng)力分布類似,股骨頭峰值應(yīng)力區(qū)位于股骨頭后外側(cè),壞死股骨頭表面后方出現(xiàn)多點(diǎn)、多區(qū)的應(yīng)力集中,前外側(cè)則出現(xiàn)1條相對(duì)于周圍應(yīng)力增高的應(yīng)力帶。②股骨頭壞死區(qū)底部應(yīng)力分布情況。相同壞死范圍下,股骨頭在不同載荷作用下,壞死區(qū)底部的應(yīng)力分布基本一致,載荷越大,相應(yīng)區(qū)域的應(yīng)力值越大; 壞死組織體積分?jǐn)?shù)為30%時(shí),壞死區(qū)底部應(yīng)力分布以外側(cè)、后側(cè)為主,越接近活骨組織其應(yīng)力值越大,峰值應(yīng)力區(qū)位于死骨與活骨交界邊緣的后方; 壞死組織體積分?jǐn)?shù)為50%、60%時(shí)不同載荷下股骨頭壞死區(qū)底部應(yīng)力分布類似,外側(cè)及后側(cè)存在明顯的多點(diǎn)、多區(qū)應(yīng)力增高,峰值應(yīng)力區(qū)位于股骨頭壞死區(qū)基底部的外側(cè),基底部前方存在散點(diǎn)應(yīng)力增高區(qū)。③股骨頭壞死區(qū)表面與底部的峰值應(yīng)力。股骨頭壞死區(qū)底部的應(yīng)力明顯較股骨頭壞死區(qū)表面高; 在4 200 N載荷作用下不同壞死范圍的3種模型及2 400 N載荷作用下壞死組織體積分?jǐn)?shù)為30%的壞死模型的壞死區(qū)底部的峰值應(yīng)力(0.992 MPa、0.685 MPa、0.692 MPa、0.567 MPa)均超過壞死骨組織的臨界應(yīng)力(0.55 MPa)。④不同壞死范圍下股骨頭塌陷的可能性。9個(gè)壞死股骨頭模型僅壞死區(qū)底部峰值應(yīng)力點(diǎn)及附近小部分區(qū)域超過臨界應(yīng)力,其余大部分區(qū)域均未超過臨界應(yīng)力,即所有模型中壞死組織僅發(fā)生應(yīng)力代償不全性微骨折。結(jié)論:壞死范圍影響股骨頭壞死區(qū)的應(yīng)力分布; 壞死區(qū)底部的應(yīng)力高于壞死區(qū)表面; 應(yīng)力峰值超過臨界值時(shí)出現(xiàn)軟骨下深部松質(zhì)骨微骨折,是導(dǎo)致股骨頭塌陷的直接原因。
Abstract:
Objective:To explore the effect of femoral head necrosis areas on the stress distribution over the femoral head necrosis zones.Methods:Data set of Virtual Chinese Human male No.1 was adopted,and the finite element models of femoral head necrosis with necrotic tissue volume fractions of 30%,50% and 60% were established through Mimics software respectively,and then they were analysed by Ansys software.These models of femoral head necrosis were performed with loads of 1 440 N,2 400 N and 4 200 N respectively,and 9 models of femoral head necrosis were set in total according to the different loads and different necrosis areas.Then the stress distribution and peak stress on surface and bottom of necrosis zones were measured respectively,and the possibility of femoral head collapse was analysed.Results:Under the same necrosis areas,stress distribution over the surface of femoral head necrosis zones were basically in the same although femoral head bore different loads.The larger the load was,the greater the stress value was in the corresponding areas.When necrotic tissue volume fraction reached 30%,the closer the stress distribution came to that of live bone tissue,the greater the corresponding stress value was,and the surface peak stress zone was located at the posterolateral approach to the edge of boundary of dead bones and live bones.When necrotic tissue volume fraction reached 50% or 60%,the similar stress distribution were shown and the scope of surface of femoral head necrosis was larger than that of weight-bearing surface of femoral head.The peak stressed zone of femoral head was in the posterolateral approach to femoral head,also the multipoint and multiregion stress concentration appeared in the rear surface of necrotic femoral head,while one stress zone with relative higher stress compared with that of ambient stress was shown on anterolateral femoral head.Under the same necrosis areas,stress distribution over the bottom of femoral head necrosis zones were basically in the same although femoral head bore different loads.The larger the load was,the greater the stress value was in the corresponding areas.When necrotic tissue volume fraction reached 30%,the stress was mainly distributed over the lateral side and rear side of bottom of necrosis zone,and the closer it came to live bone tissue,the greater its stress value was,and the peak stress zone was located behind the edge of boundary of dead bones and live bones.When necrotic tissue volume fraction reached 50% or 60%,the similar stress distribution over the bottom of femoral head necrosis zone were shown under different loads,and the stress increased significantly in multipoint and multiregion of the lateral and rear side,while peak stress zone was located at the lateral side of basilar part of femoral head necrosis zones and sporadic stress concentrated area was located at the front of basilar part.The stress on bottom of femoral head necrosis zone was significantly higher than that on the surface of femoral head necrosis zone.For the three kinds of models under 4 200 N load in different necrosis areas and necrosis model with necrotic tissue volume fraction of 30% under 2 400 N load,the peak stress(0.992 MPa,0.685 MPa,0.692 MPa,0.567 MPa)on bottom of the necrosis zones were all larger than the critical stress(0.55 MPa)of necrotic bone tissue.For the 9 models of necrotic femoral head,only the peak stress on the bottom of necrosis zones and nearby small areas were larger than the critical stress,while the peak stress on most of the rest areas were all smaller than the critical stress,namely,for all the models,the tissue necrosis was only presented as stress decompensation microfracture.Conclusion:Necrosis area can affect the stress distribution over femoral head necrosis zone and stress on the bottom of necrosis zone is higher than that on the surface of necrosis zone.The microfracture of subchondral cancellous bone in the deep appear when peak stress is larger than the critical stress,which directly leads to the collapse of femoral head.

參考文獻(xiàn)/References:

[1] Ha YC,Jung WH,Kim JR,et al.Prediction of collapse in femoral head osteonecrosis:a modified Kerboul method with use of magnetic resonance images[J].J Bone Joint Surg Am,2006,88(Suppl 3):35-40.
[2] Hernigou P,Lambotte JC.Volumetric analysis of osteonecrosis of the femur.Anatomical correlation using MRI[J].J Bone Joint Surg Br,200l,83(5):672-675.
[3] Nishii T,Sugano N,Ohzono K,et al.Significance of lesion size and location in the prediction of collapse of osteonecrosis of the femoral head:a new three-dimensional quantification using magnetic resonance imaging[J].J Orthop Res,2002,20(1):130-136.
[4] Yang JW,Koo KH,Lee MC,et al.Mechanics of femoral head osteonecrosis using three-dimensional finite element method[J].Arch Orthop Trauma Surg,2002,122(2):88-92.
[5] Etienne G,Mont MA,Ragland PS.The diagnosis and treatment of nontraumatic osteonecrosis of the femoral head[J].Instr Course Lect,2004,53:67-85.
[6] Steinberg DR,Steinberg ME,Garino JP,et al.Determining lesion size in osteonecrosis of the femoral head[J].J Bone Joint Surg Am,2006,88(Suppl 3):27-34.
[7] Lee MS,Tai CL,Senan V,et al.The effect of necrotic lesion size and rotational degree on the stress reduction in Transtrochanteric rotational osteotomy for femoral head osteonecrosis a three-dimensional finite-element simulation[J].Clin Biomech(Bristol,Avon),2006,21(9):969-976.
[8] Floerkemeier T,Lutz A,Nackenhorst U,et al.Core decompression and osteonecrosis intervention rod in osteonecrosis of the femoral head:clinical outcome and finite element analysis[J].Int Orthop,2011,35(10):1461-1466.
[9] 史風(fēng)雷,張美超.建立股骨頭壞死有限元模型的方法[J].中國組織工程研究與臨床康復(fù),2008,12(30):5890-5891.
[10] Brown TD,Ferguson AB Jr.Mechanical property distributions in the cancellous bone of the human proximal femur[J].Acta Orthop Scand,1980,51(3):429-437.
[11] Brown TD,Pedersen DR,Baker KJ,et al.Mechanical consequences of core drilling and bone-grafting on osteonecrosis of the femoral head[J].J Bone Joint Surg Am,1993,75(9):1358-1367.
[12] Chen WP,Tai CL,Tan CF,et al.The degrees to which Iranstrochanteric rotational estcotomy moves the region of osteonecrotic femoral head out of the weight-bearing area as evaluated by computer simulation[J].Clin Biomech(Bristol,Avoll),2005,20(1):63-69.
[13] Yoshida H,Faust A,Wilckens J,el al.Three-dimensional dynamic hip contact area and pressure distribution during activities of daily living[J].J Biomech,2006,39(11):l996-2004.
[14] Langlais F,Fourastier J.Rotation esteotomies for ogleonecresis of the femoral head[J].Clin Orthop Relat Res,1997,(343):110-123.

備注/Memo

備注/Memo:
通訊作者:何偉 E-mail:[email protected]
更新日期/Last Update: 2012-10-20