Mechanical performances of hip implant design and fabrication with PEEK composite

Polymer ◽  
2021 ◽  
Vol 227 ◽  
pp. 123865
Author(s):  
Bankole I. Oladapo ◽  
S. Abolfazl Zahedi ◽  
Sikiru O. Ismail
Keyword(s):  
Implant Design ◽  
Hip Implant ◽  
Peek Composite ◽  
Mechanical Performances

scholarly journals Finite element modeling of a generic stemless hip implant design in comparison with conventional hip implants

2004 ◽  
Vol 40 (15) ◽  
pp. 2027-2047 ◽  
Author(s):  
S.A. Asgari ◽  
A.M.S. Hamouda ◽  
S.B. Mansor ◽  
H. Singh ◽  
E. Mahdi ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Implant Design ◽  
Hip Implants ◽  
Hip Implant ◽  
Element Modeling

Higher mechanical performances of CF /PEEK composite laminates via reducing interlayer porosity based on the affinity of functional s‐PEEK

2019 ◽  
Vol 40 (9) ◽  
pp. 3749-3757 ◽  
Author(s):  
Xiping Gao ◽  
Zhigao Huang ◽  
Huamin Zhou ◽  
Dequn Li ◽  
Yang Li ◽  
...  
Keyword(s):  
Composite Laminates ◽  
Peek Composite ◽  
Mechanical Performances

scholarly journals Topology Optimisation for Compliant Hip Implant Design and Reduced Strain Shielding

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7184
Author(s):  
Nathanael Tan ◽  
Richard van Arkel
Keyword(s):  
Load Transfer ◽  
Stress Shielding ◽  
Implant Design ◽  
Topology Optimisation ◽  
Hip Implant ◽  
Implant Survivorship ◽  
Hip Stems ◽  
Bone Structures ◽  
Optimisation Techniques ◽  
Strain Shielding

Stiff total hip arthroplasty implants can lead to strain shielding, bone loss and complex revision surgery. The aim of this study was to develop topology optimisation techniques for more compliant hip implant design. The Solid Isotropic Material with Penalisation (SIMP) method was adapted, and two hip stems were designed and additive manufactured: (1) a stem based on a stochastic porous structure, and (2) a selectively hollowed approach. Finite element analyses and experimental measurements were conducted to measure stem stiffness and predict the reduction in stress shielding. The selectively hollowed implant increased peri-implanted femur surface strains by up to 25 percentage points compared to a solid implant without compromising predicted strength. Despite the stark differences in design, the experimentally measured stiffness results were near identical for the two optimised stems, with 39% and 40% reductions in the equivalent stiffness for the porous and selectively hollowed implants, respectively, compared to the solid implant. The selectively hollowed implant’s internal structure had a striking resemblance to the trabecular bone structures found in the femur, hinting at intrinsic congruency between nature’s design process and topology optimisation. The developed topology optimisation process enables compliant hip implant design for more natural load transfer, reduced strain shielding and improved implant survivorship.

scholarly journals Finite Element Analysis of Different Hip Implant Designs along with Femur under Static Loading Conditions

2019 ◽  
Author(s):  
K N Chethan ◽  
N Shyamasunder Bhat ◽  
M Zuber ◽  
B Satish Shenoy
Keyword(s):  
Hip Joint ◽  
Cross Sections ◽  
Von Mises Stress ◽  
Implant Design ◽  
Element Analysis ◽  
Early 19Th Century ◽  
Hip Implant ◽  
Design Life ◽  
Von Mises ◽  
Von Mises Stresses

Background: The hip joint is the largest joint after the knee, which gives stability to the whole human structure. The hip joint consists of a femoral head which articulates with the acetabulum. Due to age and wear between the joints, these joints need to be replaced with implants which can function just as a natural joint. Since the early 19th century, the hip joint arthroplasty has evolved, and many advances have been taken in the field which improved the whole procedure. Currently, there is a wide variety of implants available varying in the length of stem, shapes, and sizes.Material and Methods: Circular, oval, ellipse and trapezoidal-shaped stem designs are considered in the present study. The human femur is modeled using Mimics. CATIA V-6 is used to model the implant models. Static structural analysis is carried out using ANSYS R-19 to evaluate the best implant design.Results: All the four hip implants exhibited the von Mises stresses, lesser than its yielded strength. However, circular and trapezoidal-shaped stems have less von Mises stress compared to ellipse and oval.Conclusion: This study shows the behavior of different implant designs when their cross-sections are varied. Further, these implants can be considered for dynamic analysis considering different gait cycles. By optimizing the implant design, life expectancy of the implant can be improved, which will avoid the revision of the hip implant in active adult patients.

scholarly journals Finite Element Analysis of Uncemented Total Hip Replacement: the Effect of Bone-Implant Interface

2018 ◽  
Vol 7 (4.26) ◽  
pp. 230 ◽  
Author(s):  
Nur Faiqa Ismail ◽  
Solehuddin Shuib ◽  
Muhd Azman Yahaya ◽  
Ahmad Zafir Romli ◽  
Amran Ahmed Shokri
Keyword(s):  
Finite Element ◽  
Coefficient Of Friction ◽  
Implant Design ◽  
Implant Loosening ◽  
Interference Fit ◽  
Bone Implant ◽  
Hip Implant ◽  
Total Hip ◽  
Finite Element Software ◽  
Press Fit

Most uncemented total hip replacements (THR) rely on press-fit for the initial stability and thus lead to the secondary fixation which is biological fixation. Choosing the accurate interference fit may have a great effect on implant stability and implant loosening prevention. Implant loosening is the most reported problem where it leads the increasing of micromotion at the bone-implant interface due to insufficient primary fixation. By having sufficient stability or fixation after surgery, minimal relative motion between the prosthesis and bone interfaces allows osseointegration to occur. Therefore, it will provide a strong prosthesis-to-bone biological attachment. The aim of this study was to evaluate the effect of bone-implant interface for uncemented hip implant. In this study, a three-dimensional model of hip implant was designed and analysed by using commercial Finite Element Software namely, ANSYS WORKBENCH V15 software in order to investigate the bone-implant interface effect using the chosen implant design. The value of interference fit (δ= 0.01, 0.05, 0.10 and 0.50 mm) and coefficient of friction (δ= 0.15, 0.40 and 1.00) were used to simulate the bone-implant interface. It was found that the interference fit of 0.50 mm was sufficient to achieve the primary fixation and also the best fitting; thus, the implant loosening can be minimized. The interference fit of 0.50 mm was the minimal value to achieve fixation, while the coefficient of friction did not affect the bone-implant interface. 

Hip Implant Design With Three-Dimensional Porous Architecture of Optimized Graded Density

2018 ◽  
Vol 140 (11) ◽  
Author(s):  
Yingjun Wang ◽  
Sajad Arabnejad ◽  
Michael Tanzer ◽  
Damiano Pasini
Keyword(s):  
Bone Resorption ◽  
Bone Loss ◽  
Three Dimensional ◽  
Stress Shielding ◽  
Implant Design ◽  
Fatigue Properties ◽  
Uniform Density ◽  
Hip Implant ◽  
Porous Implant ◽  
Porous Architecture

Even in a well-functioning total hip replacement, significant peri-implant bone resorption can occur secondary to stress shielding. Stress shielding is caused by an undesired mismatch of elastic modulus between the stiffer implant and the adjacent bone tissue. To address this problem, we present here a microarchitected hip implant that consists of a three-dimensional (3D) graded lattice material with properties that are mechanically biocompatible with those of the femoral bone. Asymptotic homogenization (AH) is used to numerically determine the mechanical and fatigue properties of the implant, and a gradient-free scheme of topology optimization is used to find the optimized relative density distribution of the porous implant under multiple constraints dictated by implant micromotion, pore size, porosity, and minimum manufacturable thickness of the cell elements. Obtained for a 38-year-old patient femur, bone resorption is assessed by the difference in strain energy between the implanted bone and the intact bone in the postoperative conditions. The numerical results suggest that bone loss for the optimized porous implant is only 42% of that of a fully solid implant, here taken as benchmark, and 79% of that of a porous implant with uniform density. The architected hip implant presented in this work shows clinical promise in reducing bone loss while preventing implant micromotion, thereby contributing to reduce the risk of periprosthetic fracture and the probability of revision surgery.

Custom hip implant design optimisation

2018 ◽  
Author(s):  
Patricia Isabela Braileanu ◽  
Ionel Simion ◽  
Benyebka Bou- Said ◽  
Nicoleta Crisan
Keyword(s):  
Implant Design ◽  
Design Optimisation ◽  
Hip Implant

Effects of high pressure on the crystallization of carbon fiber reinforced polyetheretherketone (CF/PEEK) laminate composites

1990 ◽  
Vol 48 (4) ◽  
pp. 876-877
Author(s):  
Hong-Ming Lin ◽  
C. H. Liu ◽  
R. F. Lee
Keyword(s):  
High Pressure ◽  
Carbon Fiber ◽  
Sample Surface ◽  
High Yield ◽  
Fiber Reinforced ◽  
Laminate Composites ◽  
Peek Composite ◽  
Continuous Carbon Fiber ◽  
Carbon Fiber Reinforced

Polyetheretherketone (PEEK) is a crystallizable thermoplastic used as composite matrix materials in application which requires high yield stress, high toughness, long term high temperature service, and resistance to solvent and radiation. There have been several reports on the crystallization behavior of neat PEEK and of CF/PEEK composite. Other reports discussed the effects of crystallization on the mechanical properties of PEEK and CF/PEEK composites. However, these reports were all concerned with the crystallization or melting processes at or close to atmospheric pressure. Thus, the effects of high pressure on the crystallization of CF/PEEK will be examined in this study.The continuous carbon fiber reinforced PEEK (CF/PEEK) laminate composite with 68 wt.% of fibers was obtained from Imperial Chemical Industry (ICI). For the high pressure experiments, HIP was used to keep these samples under 1000, 1500 or 2000 atm. Then the samples were slowly cooled from 420 °C to 60 °C in the cooling rate about 1 - 2 degree per minute to induce high pressure crystallization. After the high pressure treatment, the samples were scanned in regular DSC to study the crystallinity and the melting temperature. Following the regular polishing, etching, and gold coating of the sample surface, the scanning electron microscope (SEM) was used to image the microstructure of the crystals. Also the samples about 25mmx5mmx3mm were prepared for the 3-point bending tests.

3D Printed Models for Surgical Planning and Reconstructive Implant Design in Sphenoorbital Tumor Surgery

2016 ◽  
Vol 77 (S 02) ◽  
Author(s):  
Hassan Othman ◽  
Sam Evans ◽  
Daniel Morris ◽  
Saty Bhatia ◽  
Caroline Hayhurst
Keyword(s):  
Surgical Planning ◽  
Implant Design ◽  
Tumor Surgery ◽  
3D Printed
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