Special Issue "Metal and Ceramics Composite Materials for Prosthetic Hip and Knee Joint Replacement"

A special issue of Materials (ISSN 1996-1944).

Deadline for manuscript submissions: 30 June 2020.

Special Issue Editor

Dr. Saverio Affatato
E-Mail Website
Guest Editor
Laboratorio di Tecnologia Medica, IRCCS – Istituto Ortopedico Rizzoli, Via di Barbiano 1/10, 40136 Bologna, Italy
Interests: biotribology; ceramic; metal; composite; biomaterials; hip; knee; simulator; in silico; prosthesis
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Special Issue Information

Dear Colleagues,

It is a great pleasure to announce this Special Issue, Metal and Ceramics composite Materials for Prosthetic Hip and Knee Joint Replacement.

Joint replacement surgery is a successful and consolidated branch of orthopaedics. It is a progressive achievement in alleviating pain and disability, helping patients to return to an active life. The research of new biomaterials plays an important role, and, as a consequence, in vitro tests for such materials are of great importance. Knowledge of the laboratory wear rate is an important aspect in the preclinical validation of prostheses. The research and development of wear-resistant materials continues to be a high priority, in order to evaluate the performance of the new materials intended to reduce wear it is essential to ascertaining their efficacy and to prevent the possibility of unexpected failure.

This international peer-reviewed open access journal is indexed by the Science Citation Index Expanded (Web of Science) ISSN: 1996-1944, Impact Factor: 2.972.

Among the biomaterials used in the orthopaedic field, ceramic and metal composites and alloys are currently investigated as valid solutions that aim to restore a patient’s mobility and alleviate pain, assuring a low wear rate and high biocompatibility.

I hope to receive many interesting contributions.

Best Regards,

Dr. Saverio Affatato
Guest Editor

Manuscript Submission Information

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Keywords

  • hip prostheses
  • knee prostheses
  • orthopaedic
  • biomaterials
  • composites
  • alloys
  • wear
  • tribology
  • SEM analyses
  • micro-CT analyses
  • FEM
  • ceramic
  • metal
  • Raman spectroscopy
  • in silico simulation

Published Papers (4 papers)

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Research

Open AccessFeature PaperArticle
Burst Strength of BIOLOX®delta Femoral Heads and Its Dependence on Low-Temperature Environmental Degradation
Materials 2020, 13(2), 350; https://doi.org/10.3390/ma13020350 - 12 Jan 2020
Abstract
Zirconia-toughened alumina (ZTA) currently represents the bioceramic gold standard for load-bearing components in artificial hip joints. ZTA is long known for its high flexural strength and fracture toughness, both properties arising from a microscopic crack-tip shielding mechanism due to the stress-induced tetragonal-to-monoclinic (t→m) [...] Read more.
Zirconia-toughened alumina (ZTA) currently represents the bioceramic gold standard for load-bearing components in artificial hip joints. ZTA is long known for its high flexural strength and fracture toughness, both properties arising from a microscopic crack-tip shielding mechanism due to the stress-induced tetragonal-to-monoclinic (t→m) polymorphic transformation of zirconia. However, there have been concerns over the years regarding the long-term structural performance of ZTA since the t→m transformation also spontaneously occurs at the material’s surface under low-temperature environmental conditions with a concomitant degradation of mechanical properties. Spontaneous surface degradation has been extensively studied in vitro, but predictive algorithms have underestimated the extent of in vivo degradation observed in retrievals. The present research focused on burst-strength assessments of Ø28 mm ZTA femoral before and after long-term in vitro hydrothermal ageing according to ISO 7206-10. An average burst strength of 52 kN was measured for pristine femoral heads. This value was ~36% lower than results obtained under the same standard conditions by other authors. A further loss of burst strength (~13% in ultimate load) was observed after hydrothermal ageing, with increased surface monoclinic content ranging from ~6% to >50%. Nevertheless, the repetitively stressed and hydrothermally treated ZTA heads exceeded the minimum burst strength stipulated by the US Food and Drug Administration (FDA) despite severe test conditions. Lastly, Raman spectroscopic assessments of phase transformation and residual stresses on the fracture surface of the femoral heads were used to clarify burst-strength fluctuations and the effect of hydrothermal ageing on the material’s overall strength degradation. Full article
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Open AccessFeature PaperArticle
Comparison of Meshing Strategies in THR Finite Element Modelling
Materials 2019, 12(14), 2332; https://doi.org/10.3390/ma12142332 - 23 Jul 2019
Cited by 1
Abstract
In biomechanics and orthopedics, finite element modelling allows simulating complex problems, and in the last few years, it has been widely used in many applications, also in the field of biomechanics and biotribology. As is known, one crucial point of FEM (finite element [...] Read more.
In biomechanics and orthopedics, finite element modelling allows simulating complex problems, and in the last few years, it has been widely used in many applications, also in the field of biomechanics and biotribology. As is known, one crucial point of FEM (finite element model) is the discretization of the physical domain, and this procedure is called meshing. A well-designed mesh is necessary in order to achieve accurate results with an acceptable computational effort. The aim of this work is to test a finite element model to simulate the dry frictionless contact conditions of a hip joint prosthesis (a femoral head against an acetabular cup) in a soft bearing configuration by comparing the performances of 12 common meshing strategies. In the simulations, total deformation of the internal surface of the cup, contact pressure, and the equivalent von Mises stress are evaluated by using loads and kinematic conditions during a typical gait, obtained from a previous work using a musculoskeletal multibody model. Moreover, accounting for appropriate mesh quality metrics, the results are discussed, underlining the best choice we identified after the large amount of numerical simulations performed. Full article
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Open AccessArticle
In Silico Optimization of Femoral Fixator Position and Configuration by Parametric CAD Model
Materials 2019, 12(14), 2326; https://doi.org/10.3390/ma12142326 - 22 Jul 2019
Abstract
Structural analysis, based on the finite element method, and structural optimization, can help surgery planning or decrease the probability of fixator failure during bone healing. Structural optimization implies the creation of many finite element model instances, usually built using a computer-aided design (CAD) [...] Read more.
Structural analysis, based on the finite element method, and structural optimization, can help surgery planning or decrease the probability of fixator failure during bone healing. Structural optimization implies the creation of many finite element model instances, usually built using a computer-aided design (CAD) model of the bone-fixator assembly. The three most important features of such CAD models are: parameterization, robustness and bidirectional associativity with finite elements (FE) models. Their significance increases with the increase in the complexity of the modeled fixator. The aim of this study was to define an automated procedure for the configuration and placement of fixators used in the treatment of long bone fractures. Automated and robust positioning of the selfdynamisable internal fixator on the femur was achieved and sensitivity analysis of fixator stress on the change of major design parameters was performed. The application of the proposed methodology is considered to be beneficial in the preparation of CAD models for automated structural optimization procedures used in long bone fixation. Full article
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Open AccessArticle
A Critical Analysis of TKR In Vitro Wear Tests Considering Predicted Knee Joint Loads
Materials 2019, 12(10), 1597; https://doi.org/10.3390/ma12101597 - 15 May 2019
Cited by 1
Abstract
Detailed knowledge about loading of the knee joint is essential for preclinical testing of total knee replacement. Direct measurement of joint reaction forces is generally not feasible in a clinical setting; non-invasive methods based on musculoskeletal modelling should therefore be considered as a [...] Read more.
Detailed knowledge about loading of the knee joint is essential for preclinical testing of total knee replacement. Direct measurement of joint reaction forces is generally not feasible in a clinical setting; non-invasive methods based on musculoskeletal modelling should therefore be considered as a valid alternative to the standards guidelines. The aim of this paper is to investigate the possibility of using knee joint forces calculated through musculoskeletal modelling software for developing an in vitro wear assessment protocol by using a knee wear simulator. In particular, in this work we preliminarily show a comparison of the predicted knee joint forces (in silico) during the gait with those obtained from the ISO 14243-1/3 and with those measured in vivo by other authors. Subsequently, we compare the wear results obtained from a knee wear joint simulator loaded by calculated forces in correspondence to the “normal gait” kinematics with those obtained in correspondence to the loads imposed by the ISO. The obtained results show that even if the predicted load profiles are not totally in good agreement with the loads deriving from ISO standards and from in vivo measurements, they can be useful for in vitro wear tests, since the results obtained from the simulator in terms of wear are in agreement with the literature data. Full article
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