Prosthesis (Earth-5875)

A prosthesis (plural: prostheses) is an artificial device that replaces a missing body part, which may be lost through trauma, disease, or congenital conditions. Prosthetics are intended to restore the normal functions of the missing body part. Prosthetic amputee rehabilitation is primarily coordinated by a prosthetist and an inter-disciplinary team of health care professionals including psychiatrists, surgeons, physical therapists, and occupational therapists.

History
Pablo Aboim, Kat-B320, Jeremy Cruz, José de Guzman, Anthony Piotroswki, and Frank Kodiak were notable humans to sport prostheses.

By the 26th century, prosthetic limbs operate around artificial musculature of carbon-fiber weaves, with the fingers and/or toes having joints made of titanium.

The Covenant and its species are known to employ an advanced form of prosthetics. Vata 'Gajat, leader of the splinter faction known as the Blue Suns, had a prosthetic similar to an arm. Atriox, the leader of the Banished, sports a power gauntlet that  features a prosthetic left hand, which he lost to a Type-1 energy sword attack. The sangheili have already mastered the use of prosthetics for millenia; the Kaidon Ther 'Vadam used one to retake his keep after being left to die in the desert.

Trivia

 * Prosthesis at Wikipedia.