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In recent decades, metals have been considered promising materials in the fields of regenerative medicine and tissue engineering. Metallic bio-materials with excellent mechanical strength can effectively support and replace damaged tissue. Hence, metals have been widely used in load-bearing applications for dentistry and orthopedics. Cobalt-, iron-, and titanium (Ti)-based alloys are representative bio-metals, which are used in various forms, such as vascular stents, hip joints, dental, and orthopedic implants. However, the alloying elements of Co- and Fe-based alloys, Co, Ni, and Cr, induce severe toxicity when ionized in the body, which limits their clinical use. However, Ti and its alloys have been widely used as medical devices and implants, with dental and orthopedic applications due to their excellent bone-regeneration ability, mechanical properties, and corrosion resistance. Even though Ti and its alloys have generally been used for biomedical applications, there are still challenges that must be met to satisfy their clinical application. For example, osseointegration with the surrounding bone tissue at the initial stage of implantation has been pointed to as a major issue. This Special Issue, “Titanium and Its Alloys for Biomedical Applications”, has been proposed to present recent developments in biomedical applications. The nine research articles included in this Special Issue cover broad aspects of Ti-based alloys and composites with respect to their composition, mechanical, and biological properties, as highlighted in this editorial.

Technology: general issues --- History of engineering & technology --- Mining technology & engineering --- metal–matrix composites --- titanium alloy design --- microstructures --- mechanical properties --- biocomposites --- powder metallurgy --- high power impulse magnetron sputtering --- zinc oxide --- tantalum oxide --- thin film --- plasma electrolytic oxidation --- antibacterial --- biocompatibility --- ultraprecision magnetic abrasive finishing (UPMAF) --- environmentally friendly oil --- Ni-Ti stent wire --- surface roughness (Ra) --- removed diameter (RD) --- Ti alloys --- martensitic transformation --- recoverable strain --- synchrotron X-ray diffraction --- Ti6Al4V --- centrifugal casting --- ion implantation --- human osteoblast --- grade V titanium --- mini transitional implants --- narrow diameter implant --- backscattered electrons --- Ti-based biomaterials --- toxicity --- β-phase --- ω-phase --- CALPHAD --- artificial intelligence --- deep learning artificial neural network (DLANN) --- self-organizing maps (SOM) --- titanium --- surface treatment --- HA blasting --- sandblasted and acid-etched (SLA) --- anodic oxidation (AO) --- micro-arc oxidation (MAO) --- graphene oxide --- electrophoretic deposition --- implant --- biomolecule --- complex --- n/a --- metal-matrix composites

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Joint replacement is a very successful medical treatment. However, the survivorship of hip, knee, shoulder, and other implants is limited. The degradation of materials and the immune response against degradation products or an altered tissue loading condition as well as infections remain key factors of their failure. Current research in biomechanics and biomaterials is trying to overcome these existing limitations. This includes new implant designs and materials, bearings concepts and tribology, kinematical concepts, surgical techniques, and anti-inflammatory and infection prevention strategies. A careful evaluation of new materials and concepts is required in order to fully assess the strengths and weaknesses and to improve the quality and outcomes of joint replacements. Therefore, extensive research and clinical trials are essential. The main aspects that are addressed in this Special Issue are related to new material, design and manufacturing considerations of implants, implant wear and its potential clinical consequence, implant fixation, infection-related material aspects, and taper-related research topics. This Special Issue gives an overview of the ongoing research in those fields. The contributions were solicited from researchers working in the fields of biomechanics, biomaterials, and bio- and tissue-engineering.

Information technology industries --- electrocautery --- titanium alloy --- cobalt-chrome alloy --- fatigue behavior --- biomechanical study --- Vertebral body replacement (VBR) --- non metallic --- radiolucent --- CF/PEEK --- biomechanics --- tumor --- vertebral fracture --- spine --- calcium phosphate --- granules --- bone graft substitutes --- total hip arthroplasty --- implant deformation --- acetabulum --- Metasul --- 28 mm small head --- metal-on-metal THA --- cobalt --- chromium --- titanium --- blood metal ions --- inflammation --- cytokines --- metal particles --- metal ions --- synovium --- dual taper modular hip stem --- acetabular revision --- asymptomatic stem modularity --- decision making model --- threshold --- biomaterials --- arthroplasty --- orthopaedic tribology --- experimental simulation --- total knee replacement --- PEEK-OPTIMA™ --- UHMWPE --- third body wear --- modular acetabular cup --- poly-ether-ether-ketone (PEEK) --- ceramics --- ultra-high-molecular-weight polyethylene (UHMW-PE) --- strain distribution --- bone stock --- cup-inlay stability --- disassembly forces --- relative motion --- periprosthetic joint infections --- infection prophylaxis --- Staphylococcus epidermidis --- in vivo osteomyelitis model --- metal wear --- retrieval study --- metal-on-metal articulation --- volumetric wear --- megaendoprosthesis --- total knee arthroplasty --- bone tumor --- Roentgen stereophotogrammetric analysis --- hip arthroplasty --- elementary geometrical shape model --- interchangeability --- head–taper junction --- migration --- ion implantation --- precision casting --- Ti6Al4V --- calcium --- phosphorus --- centrifugal casting --- porous implants --- tantalum --- hip replacement --- revision hip arthroplasty --- primary stability --- backside wear --- cross-linked --- total hip replacement --- hip cup system --- composite --- fibers --- polycarbonate-urethane --- meniscal replacement --- mechanical properties --- meniscus --- silicon nitride --- coating --- joint replacement --- wear --- adhesion --- trunnionosis --- trunnion failure --- fretting corrosion --- head–neck junction --- mechanically assisted crevice corrosion --- implant --- biomaterial --- corrosion --- residual stress --- taper connection --- anodic polarization --- surface treatment --- knee joint --- patellar component --- musculoskeletal multibody simulation --- patellofemoral joint --- polyetheretherketone --- fixation --- debonding --- implant–cement interface --- PMMA --- periprosthetic joint infection --- cement spacer --- articulating spacer --- hip spacer --- two-stage revision --- surface alteration --- surface roughness --- third-body wear --- zirconium oxide particles --- metal-on-cement articulation --- oxford unicompartmental knee arthroplasty --- bearing thickness --- retrieval analysis --- n/a --- biomedical rheology --- viscosity --- bovine calf serum --- shear thinning --- numerical simulation --- head-taper junction --- head-neck junction --- implant-cement interface

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• Reference Manager
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Joint replacement is a very successful medical treatment. However, the survivorship of hip, knee, shoulder, and other implants is limited. The degradation of materials and the immune response against degradation products or an altered tissue loading condition as well as infections remain key factors of their failure. Current research in biomechanics and biomaterials is trying to overcome these existing limitations. This includes new implant designs and materials, bearings concepts and tribology, kinematical concepts, surgical techniques, and anti-inflammatory and infection prevention strategies. A careful evaluation of new materials and concepts is required in order to fully assess the strengths and weaknesses and to improve the quality and outcomes of joint replacements. Therefore, extensive research and clinical trials are essential. The main aspects that are addressed in this Special Issue are related to new material, design and manufacturing considerations of implants, implant wear and its potential clinical consequence, implant fixation, infection-related material aspects, and taper-related research topics. This Special Issue gives an overview of the ongoing research in those fields. The contributions were solicited from researchers working in the fields of biomechanics, biomaterials, and bio- and tissue-engineering.

electrocautery --- titanium alloy --- cobalt-chrome alloy --- fatigue behavior --- biomechanical study --- Vertebral body replacement (VBR) --- non metallic --- radiolucent --- CF/PEEK --- biomechanics --- tumor --- vertebral fracture --- spine --- calcium phosphate --- granules --- bone graft substitutes --- total hip arthroplasty --- implant deformation --- acetabulum --- Metasul --- 28 mm small head --- metal-on-metal THA --- cobalt --- chromium --- titanium --- blood metal ions --- inflammation --- cytokines --- metal particles --- metal ions --- synovium --- dual taper modular hip stem --- acetabular revision --- asymptomatic stem modularity --- decision making model --- threshold --- biomaterials --- arthroplasty --- orthopaedic tribology --- experimental simulation --- total knee replacement --- PEEK-OPTIMA™ --- UHMWPE --- third body wear --- modular acetabular cup --- poly-ether-ether-ketone (PEEK) --- ceramics --- ultra-high-molecular-weight polyethylene (UHMW-PE) --- strain distribution --- bone stock --- cup-inlay stability --- disassembly forces --- relative motion --- periprosthetic joint infections --- infection prophylaxis --- Staphylococcus epidermidis --- in vivo osteomyelitis model --- metal wear --- retrieval study --- metal-on-metal articulation --- volumetric wear --- megaendoprosthesis --- total knee arthroplasty --- bone tumor --- Roentgen stereophotogrammetric analysis --- hip arthroplasty --- elementary geometrical shape model --- interchangeability --- head–taper junction --- migration --- ion implantation --- precision casting --- Ti6Al4V --- calcium --- phosphorus --- centrifugal casting --- porous implants --- tantalum --- hip replacement --- revision hip arthroplasty --- primary stability --- backside wear --- cross-linked --- total hip replacement --- hip cup system --- composite --- fibers --- polycarbonate-urethane --- meniscal replacement --- mechanical properties --- meniscus --- silicon nitride --- coating --- joint replacement --- wear --- adhesion --- trunnionosis --- trunnion failure --- fretting corrosion --- head–neck junction --- mechanically assisted crevice corrosion --- implant --- biomaterial --- corrosion --- residual stress --- taper connection --- anodic polarization --- surface treatment --- knee joint --- patellar component --- musculoskeletal multibody simulation --- patellofemoral joint --- polyetheretherketone --- fixation --- debonding --- implant–cement interface --- PMMA --- periprosthetic joint infection --- cement spacer --- articulating spacer --- hip spacer --- two-stage revision --- surface alteration --- surface roughness --- third-body wear --- zirconium oxide particles --- metal-on-cement articulation --- oxford unicompartmental knee arthroplasty --- bearing thickness --- retrieval analysis --- n/a --- biomedical rheology --- viscosity --- bovine calf serum --- shear thinning --- numerical simulation --- head-taper junction --- head-neck junction --- implant-cement interface