Which of the following categories of knee implants is used to replace the medial and lateral surfaces of the femur and tibia?
Tricompartmental implants replace the medial and lateral surfaces of the femur and tibia, plus the patella.
What is metal hypersensitivity?
Metal hypersensitivity is a common immune disorder. Human immune systems mount the allergic attacks on metal ions through skin contacts, lung inhalation and metal-containing artificial body implants. The consequences can be simple annoyances to life-threatening systemic illness.
Can metal allergies cause joint pain?
More severe metal hypersensitivity reactions usually occur from prolonged exposure to a metal allergen through implants or metal ions that are inhaled or eaten. These reactions often cause chronic joint or muscle pain, inflammation, and swelling, leading to generalized fatigue and lack of energy.
Which of the following metals is a transition element?
The period 4 transition metals are scandium (Sc), titanium (Ti), vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), and zinc (Zn).
What is the best material for a knee replacement?
The metals commonly used include cobalt-chromium, titanium, zirconium, and nickel. Metal-on-plastic is the least expensive type of implant and has the longest track record for safety and implant life span.
Why are some people sensitive to metals?
“Metal allergies are similar to any other type of allergic reaction,” says Dr. Anthony. Your skin cells pick up small molecules of metal, which travel to your lymph nodes. Your body treats the offending substance like a foreign invader and quickly mounts an immune response.
Can I be allergic to the metal in my knee replacement?
According to Hallab et al., the prevalence of metal allergy in patients with a well-functioning TKA is 25% and can be as high as 60% in those with a poorly functioning implant [7]. Additionally, patients with a failed implant had a twofold increased risk of metal allergy compared to those with a stable implant [7].
Are knee replacements made of nickel?
Nickel is contained in some, but not all, implants. The only way to tell whether the specific implant in question contains nickel is to obtain this information from the manufacturer of the implant in question.
Why do transition metals have low reactivity?
Transition metals are less reactive relative to I and II group due to higher ionization potential and high melting point (due to greater no of bonding electrons).
What metals are used in knee replacement?
The metal parts of the implant are made of titanium- or cobalt-chromium-based alloys. The plastic parts are made of medical grade polyethylene. Some implants are made of ceramics or ceramic/metal mixtures such as oxidized zirconium.
What metal is used in a partial knee replacement?
All knee replacements, partial or total, will have parts made of a few different materials (likely metals and plastic). In most cases, each component is built from titanium, cobalt-chromium alloys, or a titanium and cobalt mixed metal.
What type of metal is used in a knee replacement?
The metal parts of the implant are made of titanium- or cobalt-chromium-based alloys. The plastic parts are made of medical grade polyethylene. Some implants are made of ceramics or ceramic/metal mixtures such as oxidized zirconium. These implants typically weigh between 15 and 20 ounces.
Why do earrings make my ears itch?
Because nickel is so prevalent in many common items (zippers, faucets, belt buckles, eyeglass hardware), many people do and will develop an allergy to this and other metallic alloys. First – if earrings make your earlobes itch or feel super sensitive, or give your skin a rash, chances are you have a nickel allergy.
What metal is a knee replacement made of?
Do titanium knee replacements contain nickel?
Most joints are an alloy of several metals, but some of the titanium alloys contain no nickel at all.
Can you have an allergic reaction to a knee replacement?
Hypersensitivity Reactions There are two reactions that seem to occur in patients who have metal hypersensitivity to a knee replacement implant. The first is a skin reaction called dermatitis. In this condition, a skin rash that looks like eczema can occur.