In medicine, a prosthesis, prosthetic, or prosthetic limb is an artificial device extension that replaces a missing body part. It is part of the field of biomechatronics, the science of using mechanical devices with human muscle, skeleton, and nervous systems to assist or enhance motor control lost by trauma, disease, or defect. Prostheses are typically used to replace parts lost by injury (traumatic) or missing from birth (congenital) or to supplement defective body parts.  I choose this artificial leg because it shows how much more we can regain our lives over someone Else's invention. Prosthetic legs have helped a lot of people who are burdened of having just one leg for the rest of their lives.  These have been designed according to our understanding on the human anatomy and leg movement.