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Case Study and Failure Analysis of a total hip Stem Fracture

charnley. Acta Orthop Scand., 48(6) (1977), 650-5. 7. Wróblewski B.M.: Fractured stem in total hip replacement - a clinical review of 120 cases. Acta Orthop Scand., 53(2) (1982), 279-84. 8. Akinola B., Mahmud T., Deroeck N.: Fracture of an exeter stem - a case report. The Internet Journal of Orthopedic Surgery, 16, 1 (2009). 9. Jarvi K., Kerry R.M.: Case report segmental stem fracture of a cemented femoral prosthesis. The Journal of Arthroplasty, 22 (2007). 10. Roffey P.: Case study: Failure of a high

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Synthesis, Characterization and Some Biological Properties of PVA/PVP/PN Hydrogel Nanocomposites: Antibacterial and Biocompatibility

films. Journal of Polymer Engineering, 38(5) (2017), 1-8. 26. Mei, Y., Saha, K., Bogatyrev, S.R., Yang, J., Hook, A.L., Kalcioglu, Z.I., Cho, S.-W., Mitalipova, M., Pyzocha, N., Rojas, F., Vliet, K.J.V., Davies, M.C., Alexander, M.R., Langer, R., Jaenisch, R., Anderson, D.G. Combinatorial development of biomaterials for clonal growth of human pluripotent stem cells. Nature Materials, 9 (2010), 768–778. 27. Lydon, M.J., Minett, T.W., Tighe, B.J. Cellular interactions with synthetic polymer surfaces in culture. Biomaterials, 6 (1985), 396-402. 28

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NANOTUBULAR TITANIUM OXIDE LAYERS FOR ENHANCEMENT OF BONE-IMPLANT BONDING AND BIOACTIVITY

NANOTUBULAR TITANIUM OXIDE LAYERS FOR ENHANCEMENT OF BONE-IMPLANT BONDING AND BIOACTIVITY

Titanium and titanium alloys are frequently used in orthopaedic implants in load bearing situations because they possess favourable properties, such as a good ductility, tensile and fatigue strength, modulus of elasticity matching that of bones, low weight, and good biocompatibility. The drawback of Ti implants is their poor osseointegration and osteoconductive properties. The present paper describes the techniques to improve the bioactivity of titanium and enhance the bone-implant bonding ability by the electrochemical anodization to fabricate titania nanotube arrays (TiO2). The naturally formed oxide layer has bio-inert character and does not readily form a strong interface with surrounding tissue. It has been proved that osseointegration of titanium implants can be improved by rough surfaces of Ti implants [1,2]. The nanotubular surface enhances adhesion, growth and differentiation of the cells. The nanotubular arrays increase the roughness of titanium implants on the nanoscale, providing the surface similar to that of a human bone. Bone-forming cells tend to adhere to the surfaces that are similar to natural bone both in chemistry and roughness. Nanotubular layers provide a high surface-to-volume ratio with controllable dimensions which are able to differentiation of mesenchymal stem cells into osteoblastic cells. Moreover, the anodized nanotubular arrays on titanium surface can be used as reservoirs for drugs (anti-inflammatory, and improving bone-growth) with prolonged drug release ability. Also, there is possibility to further enhance bioactivity of titanium implant with nanotubular surface by hydroxyapatite deposition into the titania nanotubes which further promotes bone ingrowth. The application of nanotubular structures of oxide layers can be optimized taking into consideration some important parameters as osseointegration rate and interface strength determined by nanotube mean size and length.

The paper critically reviews so far investigations focused on nanooxidation of titanium and titanium alloys. The numerical model of nanotubular arrays with the use of Finite Element Method (FEM) is proposed for an assessment of the load transfer and stress distribution under applied loading which could be a critical factor when considering the described application of nanotubes.

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POROUS BIOMATERIAL FOR ORTHOPAEDIC IMPLANTS BASED ON TITANIUM ALLOY

-90. Ryan G., Pandit A., Apatsidis D. P.: Fabrication methods of porous metals for use in orthopaedic applications. Biomaterials (2006), 27, 2651-2670. Bobyn J. D., Glassman A. H., Goto H, Krygier J. J., Miller J. E., Brooks C. E.: The effect of stem stiffness on femoral bone resorption after canine porous-coated total hip arthroplasty. Clin. Orthop. Relat. Res. (1990), 196-213. Bobyn J. D., Mortimer E. S., Glassman A. H., Engh C. A., Miller J. E., Brooks C. E.: Producing and avoiding stress shielding. Laboratory and

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Bacterial Nanocellulose as a Microbiological Derived Nanomaterial

(1) (2010) 25. 8. Wang X., Wei F., Liu A., Wang L., Wang J-C., Ren L., Liu W., Tu Q., Wang L.: Cancer stem cell labeling using poly( l -lysine)-modified iron oxide nanoparticles. Biomaterials. 33 (14) (2012) 3719. 9. Chang Y., Liu Y., Ho J., Hsu S., Lee O.: Amine surface modified superparamagnetic iron oxide nanoparticles interfere with differentiation of human mesenchymal stem cells. J. of Orthopaedic Research. 2 (2012) 1499-506. 10. Jędrzejczyk W., Nanotechnology in medycine, Meritum 2, (2006). 11. Donaldson L.: Nanosystem for effectively

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Optimal Features of Porosity of Ti Alloys Considering their Bioactivity and Mechanical Properties

References Gu Y. W., Yong M. S., Tay B. Y., Lim C. S.: Synthesis and bioactivity of porous Ti alloy prepared by foaming with TiH 2 . Materials Science and Engineering, vol. C 29 (2009), 1515-1520. Froimson M. I., Garino J., Machenaud A., Vidalain J. P.: Minimum 10-year results of a tapered, titanium, hydroxyapatite-coated hip stem. The Journal of Arthroplasty, 22, no.1 (2007), 1-7. Spoerke E. D., Murray N. G., Li H., Brinson L. C., Dunand D. C., Stupp S. I.: A bioactive titanium

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The Influence of Laser Alloying of Ti13Nb13Zr on Surface Topography and Properties

., Linossier M.T., Bouleftour W., Granier J., Peyroche S., Dumas J.-C., Zahouani H., Rattner A.: Femtosecond laser nano/micro patterning of titanium influences mesenchymal stem cell adhesion and commitment. Biomedical Materials 10 (2015), 55002. 13. Mitura S.: Novel Synthesis nanocrystalline Diamond Films. Innovative Processing of Films and Nanocrystalline Powders. IC Press (2002), 107-146. 14. Drevet R., Ben Jaber N., Fauréa J., Taraa A., Ben Cheikh Larbib A., Benhayounea H.: Electrophoretic deposition (EPD) of nano-hydroxyapatite coatings with improved

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Bioactive core material for porous load-bearing implants

biomedical application. Prog. Polym. Sci. 37 (2012), 237-280. Liu X., Ma X. P.: Polymeric Scaffolds for Bone Tissue Engineering. Ann. Biomed. Eng. 32 (2004), 477-486. Nassif L., Sabban M.: Mesenchymal Stem Cells in Combination with Scaffolds for Bone Tissue Engineering. Materials 4 (2011), 1793-1804. Liu C., Xia Z., Czrnuszka J. T.: Design and developement of three-dimensional scaffolds for tissue engineering. Chem. Eng. Res. Des. 85 (2007), 1051-1064. Liu Q., Jiang

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Self-Organized Nanotubular Oxide Layers on Ti and Ti Alloys

., Schmuki P.: Improved attachment of mesenchymal stem cells on super-hydrophobic TiO 2 nanotubes. Acta Biomaterialia 4 (2008) 1576-1582. Kunze J., Muller L., Macak J.M., Greil P., Schmuki P., Muller F.A.: Time-dependent growth of biomimetic apatite on anodic TiO 2 nanotubes. Electrochimica Acta 53 (2008) 6995-7003. Zhang W., Li G., Li Y., Yu Z., Xi Z.: Fabrication of TiO 2 nanotube arrays on biologic titanium alloy and properties. Trans. Nonferrous Met. Soc. China 17 (2007) 692

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Coatings in Arthroplasty: Review Paper

bonding to hydroxyapatite and titanium surfaces on femoral stems retrieved from human subjects at autopsy. Biomaterials 25 (2004) 5199-5208. Gross K.A., Walsh W., Swarts E.: Analysis of retrieved hydroxyapatite-coated hip protheses. Journal of Thermal Spray Technology , 13 (2), 2004, 191-199. Yoshinari M., Oda Y., Inoue T., Matsuzaka K., Shimono M.: Bone response to calcium phosphate-coated and biphosphonate-immobilized titanium implants. Biomaterials 23 (2002) 2879-2885. Nguyen H

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