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Die Arbeit versucht, mit Hilfe der Erkenntnisse der Theorie der optimalen Besteuerung Möglichkeiten aufzuzeigen, wie die bundesdeutsche Mehrwert- und Einkommenssteuer unter Beachtung verteilungspolitischer Ziele so umstrukturiert werden können, daß sie allokationspolitische Vorteile gegenüber der gegenwärtigen Steuerstruktur besitzen. Die Wohlfahrtsgewinne einer solchen Steuerreform werden mit Hilfe eines empirisch validierten mikroökonometrischen Simulationsmodells der Haushaltsbesteuerung abgeschätzt. Es zeigt sich, daß von der realen Mehrwert- und Einkommenssteuer in der Bundesrepublik erhebliche Zusatzlasten ausgehen, die mit dem abgeleiteten Reformvorschlag reduziert werden können.

Arbeitsangebot --- Bundesrepublik --- Deutschland --- Ergebnisse --- Gerold --- Haushaltsbesteuerung --- Junk --- Konsumnachfrage --- Krause --- mikroökonometrische --- OPTIMA --- optimale --- Simulation --- Theoretische

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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 --- biomedical rheology --- viscosity --- bovine calf serum --- shear thinning --- numerical simulation