There are many knee replacement systems manufactured by Stryker, and each system is made from metals and components specific to that system. While cobalt-chromium and titanium are the most common, there are several other components that can be used to make the prosthesis.
Known for its strength and resistance to corrosion, cobalt-chromium alloys are considered bio-compatible metals, although there is a small possibility of allergic reaction in patients who are sensitive to metals such as nickel. Pure titanium is used when strength is not a major factor. Titanium alloys are also used in some knee replacement systems, and these alloys commonly contain aluminum and vanadium. Due to the density and elastic nature of titanium and its alloys, some risks associated with knee replacement may be reduced.
Other, lesser used materials include tantalum, polyethylene and zirconium. A newer material is oxinium oxidized zirconium, which is basically a transformed metal alloy that has a ceramic bearing surface.