This week we focused on material selection for each component. For the material selection stage, we considered multiple possible materials and coating for each part, resulting from extensive researched. The detailed comparison is shown in the picture below and the PDF file named Material List.

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Narrowing down on the materials, we have decided the materials that we are going to use in each component, with specific technology to improve the properties of that specific material.

• Acetabular socket

  • Titanium alloy

  • stabilized by transacetabular screws made of hydroxyapatite and polyactic acid

  • microtubed are indented on the surface of the stem, allowing the osteointegration

  • Teriparatide hormone is delivered through embedded Titania-based nanotubes, covered by Poly Lactic-co-Glycolic Acid(PLGA) - a biodegradable polymer that can deliver the drug at a controlled rate

• Dual Mobility Femoral Head

  • Outer femoral head ​(outer articulation)

    • HXLPE​; highly cross linked form of ultrahigh molecular weight polyethylene (UHMWPE)

      • High wear resistance and biocompatible

      • negligible wear rates, small wear particles

    • exterior surface of the femoral coated with poly (2-methacryloyloxtethyl phosphorylcholine (PMPC), a biocompatible material that acts like a lubricant

    • Interior surface coated with Fe3O4 nanoparticles, equipping superparamagnetic property, coated with silica for biocompatibility 

  • interior femoral head (inner articulation)

    • ​silicon nitide​

    • non-oxide ceramic

    • high strength and toughness

    • high biocompatibility

• Femoral stem

  • Ti6Al4V (Titanium alloy)​: low elastic modulus to distribute more even pressure on the femur bone, preventing loss of bone density

  • thermal oxidation on Ti6Al4V increases the wear resistance and hardness of Titanium

  • microtubed are indented on the surface of the stem, allowing the osteointegration

  • Teriparatide hormone is delivered through embedded Titania-based nanotubes, covered by Poly Lactic-co-Glycolic Acid(PLGA) - a biodegradable polymer that can deliver the drug at a controlled rate