Define Prosthesis. Mention the classification and give example.

Define Prosthesis. Mention the classification and give example.


Ans: Definition (Prosthesis): It is an artificial device that replaces a missing body part. Prostheses are typically used to replace parts lost by injury or missing from birth (congenital) or to supplement defective body parts.


[A] Exoskeletal prosthesis: An exoskeletal prosthesis gains its structural strength from the outer laminated shell, through which the weight of the body is transmitted. This shell was usually made of a resin socket, which is quite durable, over a filler material of wood or foam, and the whole prosthesis is shaped to provide a cosmetic appearance of the amputated limb. The opposite surviving leg is taken for reference for shape length and skin color. Of late other materials like high density poly ethylene are also being used. The prosthetic fitting should be very perfect; otherwise lack of alignment and adjustability would pose great problems.

[B] Endoskeletal prosthesis: This is more modern in design. It gains its structural integrity from the inner endoskeleton a pylon made of metal or carbon fibre, which is a light internal modular component to provide weight bearing. The cosmetic appearance is provided by shaped foam covers slipped over the modular components.

Advantages: This design includes the ease of alignment of the components and their adjustments and the ability to interchange components by removing the foam cover.

Disadvantages:  This design is that the foam cover is not very durable and needs to be replaced often

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