Finite Element Analysis of porously punched prosthetic short stem virtually designed for simulative uncemented Hip ArthroplastyReportar como inadecuado

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BMC Musculoskeletal Disorders

, 18:295

Orthopedics and biomechanics


BackgroundThere is no universal hip implant suitably fills all femoral types, whether prostheses of porous short-stem suitable for Hip Arthroplasty is to be measured scientifically.

MethodsTen specimens of femurs scanned by CT were input onto Mimics to rebuild 3D models; their *stl format dataset were imported into Geomagic-Studio for simulative osteotomy; the generated *.igs dataset were interacted by UG to fit solid models; the prosthesis were obtained by the same way from patients, and bored by punching bears designed by Pro-E virtually; cements between femora and prosthesis were extracted by deleting prosthesis; in HyperMesh, all compartments were assembled onto four artificial joint style as: a cemented long-stem prosthesis; b porous long-stem prosthesis; c cemented short-stem prosthesis; d porous short-stem prosthesis. Then, these numerical models of Finite Element Analysis were exported to AnSys for numerical solution.

ResultsObserved whatever from femur or prosthesis or combinational femora-prostheses -Kruskal-Wallis- value p > 0.05 demonstrates that displacement of d ≈ a ≈ b ≈ c shows nothing different significantly by comparison with 600 N load. If stresses are tested upon prosthesis, d ≈ a ≈ b ≈ c is also displayed; if upon femora, d ≈ a ≈ b < c is suggested; if upon integral joint, d ≈ a < b < c is presented.

ConclusionsMechanically, these four sorts of artificial joint replacement are stabilized in quantity. Cemented short-stem prostheses present the biggest stress, while porous short-stem and cemented long-stem designs are equivalently better than porous long-stem prostheses and alternatives for femoral-head replacement. The preferred design of those two depends on clinical conditions. The cemented long-stem is favorable for inactive elders with osteoporosis, and porously punched cementless short-stem design is suitable for patients with osteoporosis, while the porously punched cementless short-stem is favorable for those with a cement allergy. Clinically, the strength of this study is to enable preoperative strategy to provide acute correction and decrease procedure time.

KeywordsUncemented short stem Porously punched prosthesis Artificial joint replacement Contact stress Finite Element Analysis Abbreviations3DThree Dimensional

CADComputer Aided Design

CAMComputer Aided Manufacturing

CTComputed Tomography

FEFinite Element

FEAFinite Element Analysis

HAHip Arthroplasty

THATotal Hip Arthroplasty

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Autor: Matthew Jian-Qiao Peng - Hai-Yan Chen - Yong Hu - XiangYang Ju - Bo Bai


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