In medicine, a prosthesis (plural: prostheses; from Ancient Greek prosthesis, "addition, application, attachment") 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 physiatrists, surgeons, physical therapists, and occupational therapists. Prosthetics are commonly created with CAD (Computer-Aided Design), a software interface that helps creators visualize the creation in a 3D form, and they can also be designed by hand.