A numerical investigation into the influence of the properties of cobalt chrome cellular structures on the load transfer to the periprosthetic femur following total hip arthroplasty

Hazlehurst, Kevin Brian; Wang, Changjiang; Stanford, Mark

doi:10.1016/j.medengphy.2014.02.008

Cited by 51 publications

(38 citation statements)

References 27 publications

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“…[299] The choice of the unit cell system, as well as the lattice parameters, impact the ingrowth behavior directly. [299] The choice of the unit cell system, as well as the lattice parameters, impact the ingrowth behavior directly.…”

Section: Am In the Medical Sectormentioning

confidence: 99%

A Review of Metal Fabricated with Laser‐ and Powder‐Bed Based Additive Manufacturing Techniques: Process, Nomenclature, Materials, Achievable Properties, and its Utilization in the Medical Sector

et al. 2018

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Additive manufacturing has multiple advantages over conventional fabrication techniques, such as the geometrical freedom and, to a great extent, the omission of tooling equipment. Hence, futuristic designs and non-standard topology-optimized structures can be fabricated without causing noteworthy extra cost, since the geometrical complexity is, exaggeratedly spoken, for free. The manufacturing time and the amount of required raw material are the key criteria, which determine the expenses. What at first glance appears as an engineer's dream, introduces its complexity in the description of the material's characteristics and their volatility to the manufacturing conditions. Within this study, the main properties (i.e., surface hardness, tensile, and compression strength, as well as fracture toughness) and their anisotropic and inhomogeneous nature are addressed. Detailed overviews of the progress to date for aluminum, iron, titanium, cobalt, and nickel based raw materials are provided. Furthermore, an overview about the state-of-the-art in the medical sector is included, comprising the areas of utilization and several trail studies.

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Section: Am In the Medical Sectormentioning

confidence: 99%

A Review of Metal Fabricated with Laser‐ and Powder‐Bed Based Additive Manufacturing Techniques: Process, Nomenclature, Materials, Achievable Properties, and its Utilization in the Medical Sector

et al. 2018

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“…The mechanical properties of additively manufactured porous biomaterials are highly dependent on the type of unit cell from which they are made [40,41,42,43,44,45]. Optimizing the mechanical properties of porous biomaterials for different applications may require combining various types and dimensions of unit cells in one single porous structure.…”

Section: Introductionmentioning

confidence: 99%

Additively Manufactured Open-Cell Porous Biomaterials Made from Six Different Space-Filling Unit Cells: The Mechanical and Morphological Properties

Ahmadi

Yavari

Wauthle³

et al. 2015

Materials

327

185

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It is known that the mechanical properties of bone-mimicking porous biomaterials are a function of the morphological properties of the porous structure, including the configuration and size of the repeating unit cell from which they are made. However, the literature on this topic is limited, primarily because of the challenge in fabricating porous biomaterials with arbitrarily complex morphological designs. In the present work, we studied the relationship between relative density (RD) of porous Ti6Al4V EFI alloy and five compressive properties of the material, namely elastic gradient or modulus (Es20–70), first maximum stress, plateau stress, yield stress, and energy absorption. Porous structures with different RD and six different unit cell configurations (cubic (C), diamond (D), truncated cube (TC), truncated cuboctahedron (TCO), rhombic dodecahedron (RD), and rhombicuboctahedron (RCO)) were fabricated using selective laser melting. Each of the compressive properties increased with increase in RD, the relationship being of a power law type. Clear trends were seen in the influence of unit cell configuration and porosity on each of the compressive properties. For example, in terms of Es20–70, the structures may be divided into two groups: those that are stiff (comprising those made using C, TC, TCO, and RCO unit cell) and those that are compliant (comprising those made using D and RD unit cell).

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“…3D printing techniques, such as EBM, enable production of complex geometries, for example, patient‐specific implants, and density matching between implants and bone, thus minimizing stress‐shielding around orthopedic implants could become a reality . It is claimed that fully porous CoCr stems may not be applicable for clinical use and the use of functionally graded designs has been recommended …”

Section: Discussionmentioning

confidence: 99%

“…Ti6Al4V hip stems with adjusted porosity designed using finite element analysis (FEA), show lower stresses on the distal portions of the stems and lower stress shielding on the proximal portion as compared with solid and stiffer CoCr stems . Furthermore, FEA of CoCr stems indicate that the stiffness configuration influences the periprosthetic stress values and that increasing the porosity could reduce stress shielding …”

Section: Introductionmentioning

confidence: 96%

“…7 Furthermore, FEA of CoCr stems indicate that the stiffness configuration influences the periprosthetic stress values and that increasing the porosity could reduce stress shielding. 8 Co and Cr ions have been demonstrated to produce highly cytotoxic effects, 9,10 considerably higher than Ti ions. [11][12][13] As observed in vitro, Co ions also reduce the osteogenic differentiation of mesenchymal stem cells and reduce concentration of integrin-binding sialoprotein and osteocalcin, all of which may negatively influence osteogenesis.…”

Section: Introductionmentioning

confidence: 99%

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Osseointegration of 3D printed microalloyed CoCr implants—Addition of 0.04% Zr to CoCr does not alter bone material properties

Shah

Jergéus

Chiba

et al. 2018

J Biomedical Materials Res

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Electron beam melting (EBM) is a three-dimensional (3D) printing technique for the production of metal structures where complex geometries with interconnected porosities can be built. Incorporation of as little as 0.04% Zr into the CoCr alloy can significantly improve the biomechanical anchorage of constructs fabricated by EBM. Here we investigate bone material properties, including microstructure and composition, adjacent to 3D printed CoCr implants with and without addition of 0.04% Zr, after 8 weeks of healing in the rabbit femur. In low amounts, zirconium addition does not alter the microstructure and extracellular matrix composition of bone formed adjacent to the surface of EBM manufactured implants. Bone ingrowth into surface irregularities of 3D printed CoCr and CoCr + Zr implants is seen. Extensive remodeling is also evident. Osteocytes attach directly on to the implant surface. The interfacial tissue at CoCr and CoCr + Zr has similar mineral crystallinity, apatite-to-collagen ratio, carbonate-to-phosphate ratio, Ca/P ratio, bone-implant contact, percentage porosity, and osteocyte density (N.Ot/B.Ar). Compared to the native bone, the mineral crystallinity of the interfacial tissue was lower while N.Ot/B.Ar was higher for both CoCr and CoCr + Zr. Overall, the results indicate that bone tissue adjacent to CoCr and CoCr + Zr implants is highly mature and exhibits comparable healing kinetics. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 106A: 1655-1663, 2018.

show abstract

A numerical investigation into the influence of the properties of cobalt chrome cellular structures on the load transfer to the periprosthetic femur following total hip arthroplasty

Cited by 51 publications

References 27 publications

A Review of Metal Fabricated with Laser‐ and Powder‐Bed Based Additive Manufacturing Techniques: Process, Nomenclature, Materials, Achievable Properties, and its Utilization in the Medical Sector

A Review of Metal Fabricated with Laser‐ and Powder‐Bed Based Additive Manufacturing Techniques: Process, Nomenclature, Materials, Achievable Properties, and its Utilization in the Medical Sector

Additively Manufactured Open-Cell Porous Biomaterials Made from Six Different Space-Filling Unit Cells: The Mechanical and Morphological Properties

Osseointegration of 3D printed microalloyed CoCr implants—Addition of 0.04% Zr to CoCr does not alter bone material properties

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