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275 Words


THA Revision - Recon - Orthobullets

Previous studies (–)mainly simulated the compression and bending experiments of theartificial joint implanted into the femur, while the presentexperiment was designed to stimulate total hiparthroplasty, and wasimplanted with the prosthesis retained femoral neck made in Germanyand traditional prosthesis made by Beijing Prussia.

Management of Acute Hip Fracture — NEJM
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The femur is a viscoelastic solid material, and thecharacteristics of such biological materials include stressrelaxation and creep. Stress relaxation and creep experiments areimportant methods to study the simulated stability of total hiparthroplasty prostheses. This experiment compared the stressrelaxation and creep rheology of simulated total hip arthroplasty,the traditional prosthesis implantation group and the anatomicfemoral prosthesis group. The stress relaxation, creepcharacteristics, stress, variation rule of strain and time of thespecimens of the three groups were obtained. The details of theexperimental methods used are as follows: i) The stress relaxationand creep characteristics of the two specimens of the traditionalprosthesis group and anatomic prosthesis group at the sameexperimental set speed, the same constant strain, the same constantstress and the same test temperature were recorded. The test timeconditions were 7200 sec. ii) The experimental design was acomparative analysis for randomized specimens. iii) Each specimenwas independent, and the experimental data error was evaluated bystatistical analysis and t-test methods. The stress relaxation,creep characteristics, stress, variation rule of strain and time ofthe specimens of the three groups were obtained and theviscoelastic characteristics of the specimens of the two groupswere quantitatively compared. This experiment was based onmathematical statistical methods, and quantitatively compared thestress relaxation and creep properties of the two groups to assessthe rheological indicators of the specimen on the traditionalimplantation group and anatomic prosthesis group. Due to body age,health status, occupation and individual differences, theexperimental data varied to a certain degree, but also revealed thestress relaxation and creep properties of the specimens of thetraditional implantation group and anatomic prosthesis group.

Allograft Transplant of the knee

Country: France Born June 4 th, 1956 in Metz (France); married, 2 children
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After the total hip replacement, the joint stresswas spread to the femur through the prosthesis, and the transfer ofthe stress changed, resulting in stress shielding and stressconcentration. Beulah () used the finite element model tostudy the new prosthesis design, hexagonal cross-section with lowelastic modulus, and concluded that this form would be moreconducive to reducing the stress shielding and enhancing thefixation of the prosthesis. Certain researchers reconstructed thefinite element analysis model with metal-metal hip resurfacingarthroplasty, virtually loaded and simulatively calculated themodel to compare and analyze the femoral stress distribution aftersurgery. The results showed that after surgery, stress was mainlyconcentrated in the medial side of the femoral neck and thejunction of the head and neck, and stress shielding in the lowersclerotin of femoral prosthesis was observed. After the hipresurfacing arthroplasty, stress concentration and stress shieldinghad some contact with femoral and neck fracture (). Fouad () used the finite element method todemonstrate that small changes of the material properties ofartificial femoral head may have a great impact on the stressdistribution of the hip joint.

Additive manufacturing of biomaterials - ScienceDirect

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