Study On The Distribution Of Bone Interface Stress Force Of Artificial Hip Joint Of Different Materials Prosthesis

Objective: Through method of computer three-dimensional(3-D) finite elementanalysis(FEA), understand the stress distribution rule of artificial hip prothesis combination ofdifferent material types under the stress condition. And provide helpful reference for clinicalapplication of artificial hip prothesis from the biomechanics point of view.Method: Applying method of three-dimensional(3-D) finite element analysis to testbiomechanics of total hip replacement circa. 1. Elect case and supply prosthesis: elect a cliniccase of 56 age woman of artificial hip replacement of femoral neck fracture. Prosthesissample be provided by Plus company, the model is EP-FIT press match type of sphericitymortar, PE standard lining, Co and Cr and Mo alloy top, SL stock. 2.1. Found model ofthree-dimensional(3-D) finite element: applying 3D 8 nodes hexahedron one by one creptcheckout. Elect a set Preoperative spoke CT of fem epimere of trouble side hip. Mapp theprothesis. Use Super-sap founded tow sets models of three-dimensional(3-D) finiteelement. Through changing the parameter of prosthetic material, elastic modulus, Poisson'sratio, found eight above-mentioned correlated models of after Replacement. 2.2. Modeldesignate grouping:: according to different materials combination, difference designatePCA(PE- Co and Cr and Mo alloy: of the total, P represents super high molecular weightpolyethylene inner lining ,C represents Co and Cr and Mo alloy, T represents A1203 ceramics,A represents SL Ti alloy handle, below alike), PTA,TTA,CCA. Another to suppose usingcapillary shape hollow enhance (CFR/PSF)composite as various kinds combination of handle,differently named PCF (PE- Co and Cr and Mo alloy; F represents CFR/PSF),PTF,TTF,CCF; and it is named after ZHQ before replacement. 3. Measure and analyze of stress and bias:use above models to differently simulate conditions of single pelvic standing, analyze globalstress mode of femur and acetabular of prosthesis implantation circa and stress disposition and bias variation rule of prosthesis exerting on the bone interface.Result: 1. It does not change the stress mode of whole femoral bone after various kinds ofprosthetic replacement, furthermore there is more higher stress at the combine of handle andneck, equivalent stress peak value all located at the distal end of corresponding femoral bonearea, but stress peak value decrease to some extent, it decreases most obviously in the calearfemorale, dodge rate is maximum, and the femoral bone stress value that use elastic moduluslower than Ti alloy as handle more verge physiology range. The dodge rate is lower incorresponding area. Compared replacement front to after, if use Ti alloy as handle, besides E1and E2 area, it has not significant difference; if use CFR/PSF as handle, besides E1, D2andE2 area, it all has significant difference. As far as the same handle comparatively speaking,Not only metals-metals, ceramic-ceramic, ceramic-polythene, but also metals- polythenecombination, the stress size has not significant difference in the same area after femoral bonereplacement (P＞0.05). 2. Various kinds of component prosthesis exert stress that has increasedgradually tendency on femoral bone interface from proximal end to remote end, and the stessand bias value of corresponding interface in different combination of same prosthesis handlehas not significant difference (P＞0.05), but the CFR/PSF of lower elastic modulus comparewith Ti alloy handle, the corresponding interface exist more higher stress and bias. 3. It existsmore higher stress in the top sky part of acetabular bone before replacement and the stressdecrease progressively peripherad; the stress mainly concentrates in the acetabular perimeterarea after replacement, and stress and bias of interface assume decreasing tendency fromacetabular bone top to decoct later to front below, but the stess and bias value ofcorresponding interface in different combination of the same area have not significantdifference(P＞0.05).Conclusion: 1. It exists more higher stress in the cohere of handle and neck after variouskinds prosthesis implantation, show this place is a key position; In the same time it shape amore higher stress dodge in the calcar femorale. But use CFR/PSF of lower elastic modulus ashandle, the stress dodge rate is lower in femoral bone. 2. The stress rule that it has increasedgradually tendency in the femoral bone interface from proximate to far end, consistent withthe contriving principle; the CFR/PSF of lower elastic modulus, although it can lessen stressdodge, the femoral bone interface stress and bias are more higher, and these are the mainfactor of bringing about jog of prosthesis. 3. Not only metals-metals, ceramic-ceramic, ceramic-polythene, but also metals- polythene combination, the stess and bias value ofcorresponding interface in different combination of same prosthesis handle have notsignificant difference, experiment indicate that mechanics factor is not at all the main standardof selection prosthesis combination.