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Improved wear, mechanical, and biological behavior of UHMWPE-HAp-zirconia hybrid nanocomposites with a prospective application in total hip joint replacement

Salari, M ; Sharif University of Technology | 2018

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  1. Type of Document: Article
  2. DOI: 10.1007/s10853-018-3146-y
  3. Publisher: Springer New York LLC , 2018
  4. Abstract:
  5. Medical engineering advances in total joint replacements and societies’ rising demand for long-lasting materials have proven it essential to manufacture materials that are more similar to the original tissue in the fields of mechanical, tribological, and biological properties. Ultra-high molecular weight polyethylene (UHMWPE) is a polymer widely used in arthroplasty applications due to its biocompatibility, chemical stability, and reasonable mechanical properties; however, it still fails to entirely meet the standards of the hip joint implant. In this study, different concentrations of nanosized zirconia were added to UHMWPE and HAp matrix with an intended application in arthroplasty. Liquid-phase ultrasonication and hot pressing were employed to disperse the reinforcing phases and to form the final standard samples, respectively. Tensile, Vickers hardness, and pin-on-disk tests were carried out to evaluate mechanical and wear properties of the samples. In the meanwhile, in vitro biological properties were studied via MTT assay, alkaline phosphatase enzyme activity, and cell morphology tests. Dispersion features, microstructural structures, and cell adhesion were also assessed using scanning electron microscopy (SEM). Results indicate improvement in both tensile and wear properties by zirconia addition; for instance, the sample containing 10 wt% zirconia and 10 wt% HAp exhibits 45% increase in yield strength and 64% reduction in coefficient of friction. On the other hand, biological properties have also significantly improved with zirconia incorporation, at which all samples proved to be biocompatible with an increase in both osteoblasts activity and cell adhesion with increasing zirconia concentration. © 2018, Springer Science+Business Media, LLC, part of Springer Nature
  6. Keywords:
  7. Alkalinity ; Arthroplasty ; Biocompatibility ; Biomechanics ; Cell adhesion ; Chemical stability ; Enzyme activity ; Friction ; Hip prostheses ; Hot pressing ; Mechanical properties ; Nonmetallic matrix composites ; Orthopedics ; Phosphatases ; Polymeric implants ; Scanning electron microscopy ; Tissue engineering ; Ultrahigh molecular weight polyethylenes ; Vickers hardness ; Wear of materials ; Zirconia ; ALkaline phosphatase ; Biological properties ; Coefficient of frictions ; Hybrid nanocomposites ; Prospective applications ; Total hip joint replacements ; Total joint replacement ; Zirconia incorporations ; Biological materials
  8. Source: Journal of Materials Science ; 2018 ; 00222461 (ISSN)
  9. URL: https://www.tandfonline.com/doi/abs/10.1080/17597269.2018.1496385?journalCode=tbfu20