Designing and analysis of the femoral neck for an artificial hip joint prosthesis (original) (raw)
Related papers
Finite element analysis of new design artificial hip prosthesis
THE 4TH INTERNATIONAL CONFERENCE ON MATERIALS AND METALLURGICAL ENGINEERING AND TECHNOLOGY (ICOMMET) 2020, 2021
Bone is an organ with solid and hard structures that form the human skeleton and is a part of the human body that is vital in its role. Human bones have several problems such as decreased strength (Osteoporosis), contracting diseases such as bone cancer and arthritis, and human bones can fracture due to accidents or harsh impacts. For these cases, the alternative treatment given to patients is an artificial bone replacement. The choice of implant material is very important especially at the location of the joint, such as the hip prosthesis joint (hip bone). At the joint location, it needs materia ls that have good strength and wear resistance. Besides that, the design of the hip prosthesis joint implant is also very influenced by the patient's treatment results. A metal-on-metal (MoM) model that is without the use of bone cement (cementless) is more suitable for application in young patients who have high mobility in activity. The MoM model with the same material was chosen with the reason to prevent corrosion in the body cause environmental effect. Geometries design also plays an important role in the healing process and patient comfort. Forces applied to the implant due to human activity generates several forces and failed implant material. Therefore, it is important to ensure the hip prostheses against static force. In this study, five Artificial Hip Prosthesis (AHP) designs with varying thickness and number of holes for hip prosthesis were modeled. Static behavior and responses of these AHP designs were analyzed using ANSYS 19.1. Static analyses were conducted under body load. SolidWorks 2014 was used for CAD modeling of t he AHP designs. The performance of the new AHP designs was investigated for CoCrMo and SS 316 L mate rials and compared to each other. The design objective for AHP design is to have a low equivalent von misses stress (safety factor) and displacement. Based on the static analysis result, the safety factor for the fatigue life of the implant design has been calculated based on Goodman, Soderberg, and Gerber fatigue theories. The result shows that Design made of CoCrMo is better than SS 316 L
New Hip Prosthesis Design and Evaluation with Using Finite Element Analysis
Journal of Polytechnic
Highlights ❖ The use of traditional hip prosthesis has some disadvantages due to mechanical problems. The main problem in the traditional prosthesis is the load transfer. The load transfer of the traditional prosthesis is not the same as the healthy femur. Because of this, the failure of the traditional prostheses occurs. The load transfer of the femur should not be changed in the prosthesis design. In this study, the new prosthesis design was developed taking into account this main issue.
Finite Element Analysis of Hip Prosthesis with Neck Fracture under Various Human Activities
international journal for research in applied science and engineering technology ijraset, 2020
The functioning of the normal and defective artificial hip joint during various movements has been studied with the help of finite element analysis. The movements selected for this analysis were flexion, extension, abduction and adduction. These are the basic movements for a hip joint combination of which results to various day to day activities. These movements have been analyzed for both defective and non defective artificial hip joints. Three different materials namely titanium alloy, cobalt chromium alloy and stainless steel are used for the study. A 3D modeling software, meshing software and finite element analysis software have been used in this study. The obtained results from the analysis have been evaluated and the stresses and deflections were compared with the acceptable values of the respective materials. The stresses exceeding the yield strength have been concluded to result in fracture. The conclusions made helped in determining the possibility of failure of the artificial hip joint and hence avoid secondary hip replacement. Index Terms: Artificial Hip Joint (Hip Prosthesis), Finite Element Analysis, Revision Hip Surgery, Total Hip Replacement, Total Hip Arthroplasty
Stress and Deformation Analysis of Hip Joint for Design of Hip Prosthesis
Advances in Materials and Mechanical Engineering, 2021
Biomechanics is a study of the musculoskeletal system and the resulting forces acting on them. Hip joint plays a vital role in the musculoskeletal system, which is why there is a need to analyze it more critically. However, with today's knowledge of the mechanism of the hip, the study and analysis of stress distribution over the joint are limited. Recreating the environment according to daily activities is very important in the experimental analysis of the joint. This approach is difficult to conduct without and changes to the physiological environment. Numerical methods like finite element methods are used to analyze these systems without any damage or invasive processes. This paper has adopted a novel approach to analyze hip joint using 3D volumetric model generation techniques and finite element method. The hip joint is segmented from the computed tomography (CT) scans of a patient, and the bone model is developed with thresholding and volume generation algorithms. The joint along with the complete hip anatomy has been meshed with octahedral elements. A static load has been considered to apply at the hip joint, and the effect of the load is computed and analyzed. The analyzed data will help for effective design of hip prosthesis and an appropriate selection of material.
Finite element study on the predicted equivalent stresses in the artificial hip joint
Journal of Biomedical Science and Engineering, 2012
The subsurface fatigue that occurs in the Ultra-High Molecular Weight Polyethylene (UHMWPE) hip joint cup has been identified to be correlated with the contact stress at that cup. This cup stress is known to be affected by the implant design, dimensions and materials. In this study, a 3D finite element modeling has been used to investigate the effects on the cup contact stress when using low stiffness Titanium alloy (Ti) as a femur head. Also, the effects on the cup contact stress due to using different sizes of femur heads, and the presence of metal backing shell with different thicknesses are studied. The finite element results show that the use of low stiffness Ti alloy femur head results in a significant decrease in the cup contact stress compared with Stainless Steel (SS) and Cobalt Chromium (Co Cr Mo) femur heads. The presence of metal backing shell up to 1 mm thickness results in a remarkable decrease in the cup contact stresses especially for small femur heads. Finally, the use of larger femur heads, up to 32 mm diameter, results in significant decrease in the overall predicted hip joint contact. The present results indicate that any changes in design and geometrical parameters of the hip joint have significant consequences in the long term behaviour of the artificial hip joint and should be taken into consideration.
Total hip prosthesis is a treatment for the osteoarthritis of the hip as well as for the hip fractures for the elder patients. Nowadays to improve the longevity, new designs have been developed for the hip implants by considering the implant size and the best long term performance. From the literature, it is found that the proximal end with trapezoidal cross-section will be a better design for the hip implant model [1]. Also, it is observed that the material removal concept of making hollow drill and holes in the femoral stem will increase the life as well as it reduces the weight of the hip joint replacements [2]. The present paper implements the concept of merging those ideas of trapezoidal cross-sectional area in the proximal zone with the hollow drill and holes in the femoral stem to develop a new hip implant design using the finite element concepts. Also instead of multiple holes in the femoral stem, single hole with different shapes is adopted in this paper and the stem is analyzed for the static loading case. The analysis results concluded that the developed von Mises stress in the proposed design is much lower than the previous design.
The effect of stem structure on stress distribution of a custom-made hip prosthesis
Proceedings of the Institution of Mechanical Engineers. Part H, Journal of engineering in medicine, 2010
A custom-made hip is essential for the initial stability and longevity which correspond to an optimal stress distribution, since a standard hip cannot always satisfy every patient's need. In order to find out the designing principles of a custom-made hip, a patient's personal features on which the design was based were acquired. In this study, an integrated finite element model of the hip (including ilium, acetabular cup, femoral head, femoral stem, and femur) was created based on the computed tomography (CT) images of this patient. A series model with different stem length, cross-section, and collodiaphyseal angle were analysed under both static and quasi-static loading conditions. Comparing the stress distribution on each part of the hip prosthesis with that of the natural hip before replacement, the optimal stem structure for this patient was found. In addition, the changes of interspace between acetabular cup and femoral head were measured according to dynamic CT images ...
Studies on Stress Analysis of Hip Prosthesis Implant
Journal of Engineering Research and Sciences
Biomedical engineering has become a solution for many biological problems by the application of principles and problem-solving techniques. Pacemakers, artificial bone replacements, 3-D printed organs, and dental replacements are very common examples of an application of engineering in the biomedical field. In medical applications when there is a need for bone replacement in a patient who is suffering from arthritis, the hip joint replacement cannot be avoided. The use of the artificial hip joint is going more popular and has become a need in the case of arthritis. An artificial hip implant is essential for providing initial stability at the place of failure. The comparative study in this field is limited and needs to be studied thoroughly. This paper focuses on a comparative study of hip replacement implants using SS (stainless steel) and Ti6Al4V (titanium alloy). In this study, 3dimensional finite element analysis (using ANSYS2020) of hip replacement implant is performed by applying directional loads to detect von-mises stress amount, stress locations, and deformation in the implant. Assembly of the hip replacement implant is modeled (using Fusion 360) and static structural analysis is separately done using two different materials (SS and Ti-6Al-4V) for the femoral stem and using HDPE and HDPE/0.25MWCNT/0.15 for acetabular cup and liners respectively. Boundary conditions and loads applied are unchanged while varying parameters are the neck angle of implant and materials used. A similar static structural analysis for the elevated liner and flat liner at three different shell inclinations is done separately using the model which has shown better results. This study will help the researchers for further study on stress analysis of hip prosthesis implants.
The paper deals with finite element (FE) models of femoral stems aimed at supporting fatigue mechanical tests according to Medical Devices Standards. A basic model was created in agreement with the ISO7206-4:2010 requirements and used to investigate a certain number of varied configurations: the abduction and the flexion angle were varied in the range 2°÷15° and 2°÷13° respectively, and the constraint level in the range (30÷80)mm. Once the most critical configuration had been identified, femur-like FE models were created to investigate it in a context closer and closer to the in-vivo scenario: the models, in fact, were based on a femur-like fixture, and on various materials to simulate cement and cancellous bone. Both Titanium and Co-Cr-Mo alloys were used for the stem. For both alloys the highest stresses were found in correspondence with a 80 mm constraint and a more soft cancellous bone; higher risky deflection was estimated for the Titanium stem. The great potential of FE method...