Effect of dynamic loading on hip implant using finite element method

Joshi, Tanuja; Gupta, Ganesh

doi:10.1016/j.matpr.2020.11.378

Cited by 10 publications

(7 citation statements)

References 18 publications

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“…Additionally, it is necessary to take into account the friction between bone and implant. In addition, the dynamic loading condition should be the main trend of future research [ 34 ].…”

Section: Discussionmentioning

confidence: 99%

Numerical and Experimental Study of a Lattice Structure for Orthopedic Applications

2023

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Prosthetic reconstructions provide anatomical reconstruction to replace bones and joints. However, these operations have a high number of short- and long-term complications. One of the main problems in surgery is that the implant remains in the body after the operation. The solution to this problem is to use biomaterial for the implant, but biomaterial does not have the required strength characteristics. The implant must also have a mesh-like structure so that the bone can grow into the implant. The additive manufacturing process is ideal for the production of such a structure. The study deals with the correlation between different prosthetic structures, namely, the relationship between geometry, mechanical properties and biological additivity. The main challenge is to design an endoprosthesis that will mimic the geometric structure of bone and also meet the conditions of strength, hardness and stiffness. In order to match the above factors, it is necessary to develop appropriate algorithms. The main objective of this study is to augment the algorithm to ensure minimum structural weight without changing the strength characteristics of the lattice endoprosthesis of long bones. The iterative augmentation process of the algorithm was implemented by removing low-loaded ribs. A low-loaded rib is a rib with a maximum stress that is less than the threshold stress. Values within the range (10, 13, 15, 16, 17, 18, 19 and 20 MPa) were taken as the threshold stress. The supplement to the algorithm was applied to the initial structure and the designed structure at threshold stresses σf = 10, 13, 15, 16, 17, 18, 19 and 20 MPa. A Pareto diagram for maximum stress and the number of ribs is plotted for all cases of the design: original, engineered and lightened structures. The most optimal was the designed “lightweight” structure under the condition σf = 17 MPa. The maximum stress was 147.48 MPa, and the number of ribs was 741. Specimens were manufactured using additive manufacturing and then tested for four-point bending.

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“…Additionally, it is necessary to take into account the friction between bone and implant. In addition, the dynamic loading condition should be the main trend of future research [ 34 ].…”

Section: Discussionmentioning

confidence: 99%

Numerical and Experimental Study of a Lattice Structure for Orthopedic Applications

2023

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“…The FEM technique [27][28][29][30] is a fast and efficient technique widely employed for solving complex shape analysis. Additionally, these techniques are used to assist and optimize the design of hip prostheses and provide an understanding of their mechanical behavior under multiple loading constraints [31][32][33]. The finite element model of the prosthesis assembly is depicted in Figure 1.…”

Section: Materials and Methods Finite Element Modelingmentioning

confidence: 99%

Dynamic Fatigue Behavior of Hip Joint under Patient Specific Loadings

Joshi

Sharma²,

Mittal³

et al. 2022

Int. J. Automot. Mech. Eng.

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In the present work, a finite element model with standard Charnley’s implant of hip joint is considered for investigation under different patient-specific dynamic activities obtained in vivo. The application of forces occurred due to human movement, which ultimately generates dynamic stress over the prosthesis. Anatomical loading constraints are more clinically relevant than ISO standards. The performance of different materials for each suitable gait pattern is analyzed using commercial finite element code. A liner isotropic material Ti-6Al-4V and PMMA material is utilized for an implant and bone cement, respectively. However, cortical and cancellous bone are treated as non-isotropic in nature. Clinically obtained dynamic forces and torque are being used for the present investigation. Additionally, Goodman, Solderberg, Gerber and ASME elliptic fatigue theories were considered to obtain the fatigue life of the implant. The most strenuous activity in terms of stress and strain are, going downstairs followed by going upstairs, walking, standing up and sitting down, which have been found in good agreement with the safety factor for every activity. Additionally, the life expectancy of the implant was a minimum of 23 years under every dynamic motion. The present work exhibits the greater relevance in terms of the life expectancy of implant for the pre-surgical analysis before implanted in vivo.

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“…This study revealed that the carbon fiber composite material has the mechanical properties to withstand the physiological stress of a hip joint but that insufficient bone fixation due to the smooth surface of the prosthesis caused early loosening of the implant. Therefore, the tissue response of a carbon stem with hydroxyapatite coating [22] was evaluated by observing a high degree of bone apposition to carbon fiber composite implants coated with HA. The lack of short-term inflammation and adverse tissue response to carbon fiber composite implants that support the ongoing evaluation of this composite technology for use in THA were also studied.…”

Section: Stem Optimization To Reduce Stress Shieldingmentioning

confidence: 99%

Topology Optimization of a Femoral Stem in Titanium and Carbon to Reduce Stress Shielding with the FEM Method

et al. 2023

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Arthroplasty is commonly performed to treat advanced osteoarthritis or other degenerative joint conditions; however, it can also be considered for young patients with severe joint damage that significantly limits their functionality and quality of life. Young patients are still at risk of aseptic mobilization and bone resorption due to the phenomenon of stress shielding that causes an uneven distribution of tensions along the femoral contact surface prosthesis. This phenomenon can be limited by choosing the material of the prosthesis appropriately or by varying its stiffness, making sure that its mechanical behavior simulates that of the femur as much as possible. The aim of this study is to evaluate the mechanical strength of a prosthesis optimized both in shape and material and compare the results with a standard titanium prosthesis. Methods: Through three-dimensional modeling and the use of finite element method (FEM) software such as ANSYS, the mechanical behavior of traditional prosthesis and prosthesis optimized topologically respecting the ASTM F2996-13 standard. Results: With topological optimization, there is a stress reduction from 987 MPa to 810 MPa with a mass reduction of 30%. When carbon fiber is used, it is possible to further reduce stress to 509 MPa. Conclusions: The reduction in stress on the femoral stem allows an optimal distribution of the load on the cortical bone, thus decreasing the problem of stress shielding.

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Effect of dynamic loading on hip implant using finite element method

Cited by 10 publications

References 18 publications

Numerical and Experimental Study of a Lattice Structure for Orthopedic Applications

Numerical and Experimental Study of a Lattice Structure for Orthopedic Applications

Dynamic Fatigue Behavior of Hip Joint under Patient Specific Loadings

Topology Optimization of a Femoral Stem in Titanium and Carbon to Reduce Stress Shielding with the FEM Method

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