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Home/Questions/Q 1582
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Shetty
ShettyGold
Asked: May 23, 20202020-05-23T01:50:54+05:30 2020-05-23T01:50:54+05:30

We use Chromium Cobalt alloys for hip replacement and bio implants because of wear and corrosion resistance. Hypothetically, if the alloy starts eroding because of the physical or chemical changes in the implanted patient’s body. What could be the remedies for that situation?

We use Chromium Cobalt alloys for hip replacement and bio implants because of wear and corrosion resistance. Hypothetically, if the alloy starts eroding because of the physical or chemical changes in the implanted patient’s body. What could be the remedies for that situation?
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    1. Arpita Samal Platinum⭐ Metallurgical and Materials Engineering student
      2020-05-23T03:29:20+05:30Added an answer on May 23, 2020 at 3:29 am

      Corrosion of the metals used in artificial hips have been linked to metallosis, or metal poisoning. Symptoms include bone and tissue death, implant failure and severe pain. It has been found that Every biological environment has a redox (reduction-oxidation) strength that changes with physical activRead more

      Corrosion of the metals used in artificial hips have been linked to metallosis, or metal poisoning. Symptoms include bone and tissue death, implant failure and severe pain. It has been found that Every biological environment has a redox (reduction-oxidation) strength that changes with physical activity. the implant material made of cobalt, chromium and molybdenum corroded at high voltages, whereas the other alloy material made of titanium, aluminum, and vanadium remained stable under the same conditions. Also, Boron is a non-toxic element that in trace amounts can aid in bone maintenance and growth. None of the boron-containing alloys failed the ASTM F2129, the standard corrosion test for small implants. In addition, the boron-containing alloys elicited a lower level of inflammatory response as measured by lower levels of Interleukin-1β (IL-1β) being secreted. IL-1β is one of the inflammatory cytokines that could provide insights into long-term implant compatibility.

      It has been found out that some of the boron-containing alloys had outstanding corrosion behavior and excellent mechanical properties.

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    2. Mohamad Afzal Khan Gold
      2020-05-23T12:46:39+05:30Added an answer on May 23, 2020 at 12:46 pm
      This answer was edited.

      Conventionally 18/8, Cr/Ni stainless steel alloy has been used for hip bone implants which is an alloy.  Cr/Co is a composite which will give stiffness and reinforcement. Alloy corrodes, composite may degrade due to poor wetting. Both have got limitations!! In practice it has been observed that staiRead more

      Conventionally 18/8, Cr/Ni stainless steel alloy has been used for hip bone implants which is an alloy.  Cr/Co is a composite which will give stiffness and reinforcement. Alloy corrodes, composite may degrade due to poor wetting. Both have got limitations!!

      In practice it has been observed that stainless steel implants are strong and corrosion resistant, after 20 years service also the joints are strong. Why don’t we improve the strategy?

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