Spare-part surgery refers to a procedure whereby an individual receives a transplant of a particular organ or body part to replace a damaged or malfunctioning one. Alternatively, the term may refer to the replacement of a component of a machine or equipment. Synonyms for spare-part surgery include transplant surgery, organ replacement surgery, and prosthesis implantation surgery. In terms of machine equipment, similar terms could be replacement part surgery, component surgery, and mechanical component replacement surgery. Spare-part surgery has come a long way due to advances in technology and medical science, which have made it possible to perform successful transplants and prosthetic implantations.