A PINNACLE® Acetabular Cup System Product Information Provided by DePuy Orthopaedics, Inc.

Millions of patients have benefited from hip replacement surgery since it was first introduced. Options for hip replacements have continually advanced and evolved over the years. The development of any particular hip implant option is best understood in the context of this evolution and innovation.

This site provides information on ULTAMET® Metal-on-Metal Articulation, which was available from 2001 to 2013 as one of the bearing options within the PINNACLE® Acetabular Cup System, one of the most widely used and clinically successful modular acetabular systems for hip replacement.

ULTAMET Metal-on-Metal is backed by a strong record of clinical data showing reduced pain and restored mobility for patients suffering from chronic hip pain.


The hip consists of the femur (leg bone), which ends in the femoral head (ball), and the acetabulum (hip socket). The femoral head and acetabulum are covered with cartilage, which reduces friction in the joint. For a total hip replacement, the damaged bone and cartilage are removed and replaced with implants. The damaged femoral head is removed and replaced with a metal stem that is placed into the hollowed center of the femur (thigh bone). A metal or ceramic ball is placed on the upper part of the stem. This ball replaces the damaged femoral head that was removed. The damaged cartilage surface of the socket (acetabulum) is removed and replaced with a metal socket. A plastic, ceramic, or metal liner is inserted between the new ball and the socket.


The articulation in a hip joint is the area of the head of the femur bone that moves against the socket of the pelvis.

In a total hip replacement, this is the area of the ball of the hip component that moves against the liner. The material used for the femoral head and the material used for the liner are together described as a "bearing" or "articulation". For example, if the femoral ball is made of metal and the liner is made of polyethylene it is called a "metal-on-polyethylene" articulation or bearing surface. If both components are made of metal, it is referred to as a "metal-on-metal" articulation or bearing surface.