Question 2 0.4 pts The ball component of an artificial hip is made of a titanium alloy. Some manufacturers have also made the cup that receives the ball out of the same titanium alloy. For such a device, select all of the statements below that are true. These devices were pulled from the market after unforeseen complications arose. These devices are available primarily in the U.S. because of patent litigation in the European Union and other global markets. ?The hip implant will produce less debris than a metal on polymer equivalent. The metal on metal interface will wear down faster than an equivalent metal on polymer device.
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Madhur L.
Orthopedic Implants Metals such as titanium and stainless steel are frequently used for orthopedic implants such as artificial hip and knee joints. As with most metals, their elastic properties are significantly different from those of bone. Recently, metal "foams" made from aluminum and steel have been shown to have promising properties for use as implants. (a) $\mathrm{A} 0.5$ -m-long piece of bone with a certain cross-sectional area shortens by 0.10 $\mathrm{mm}$ under a given compressive force. By how much does a piece of steel with the same length and cross-sectional area shorten if the same force is applied? (b) In order to determine whether a material such as the aluminum-steel foam behaves similarly to bone, plots of measured stress (force per area) versus strain $\left(\Delta L / L_{0}\right)$ such as the ones shown in FIGURE $17-40$ may be used. Which one of these plots corresponds to a material with elastic properties equal to those of bone in compression? (c) What is the value of Young's modulus for the material represented by curve D?
25. Identify the enabling material property/properties of the following: (2 marks) a) Aluminum used in the body of an airplane. b) Cobalt chrome molybdenum alloy for hip implants.
Adi S.
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