How do cosmesis prosthetics work?

The three primary parts of a cosmesis prosthesis are the interface, the components, and the cover. The interface, which includes a frame and socket, is the part that is affixed to the body at the stump. Either a liner, typically made of silicone or soft polyurethane, or a sock is worn over the stump to make the prosthesis fit tighter and feel more comfortable. The components are the joints, the parts that function as hands and feet, and also the metal trunk, which takes the place of major bones. A cover, which is optional, is usually made of foam to resemble the missing limb. And if the user chooses, it can also have a protective covering designed to look like real skin.

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