People can lose all or part of an arm or leg for a number of reasons. Common ones include
If you are missing an arm or leg, an artificial limb can sometimes replace it. The device, which is called a prosthesis, can help you to perform daily activities such as walking, eating, or dressing. Some artificial limbs let you function nearly as well as before.
References and abstracts from MEDLINE/PubMed (National Library of Medicine)