There are two major types of artificial shoulder replacements – Cemented Prostheses and Uncemented Prostheses.
A cemented prosthesis is held in place by a type of epoxy cement that attaches the metal to the bone. An uncemented prosthesis is held in place by the tight press fit of the uncemented prosthesis into the bone canal. The choice to use a cemented or uncemented artificial shoulder is usually made by the surgeon based on your age, your lifestyle, and the surgeon’s experience.
Each prosthesis is made up of two parts: The humeral component is the portion of the artificial joint that replaces the ball on top of the upper arm bone – the humerus.
The glenoid component replaces the socket of the shoulder that actually is part of the scapula. The humeral component is made of metal. The glenoid component is usually made of a plastic cup that provides the bearing surface. The plastic used is very tough and very slick.