Femoral revision is the replacing of the old femoral stem with a new one. Femoral revision can be needed if the old stem is loose, infected, or chronically dislocates. The stem can loosen due to poor cement techniques, bad fall, bone degeneration, or infection. The femur is reamed, removing old cement and/or diseased bone, and a new femoral component is fitted and installed, utilizing the existing acetabular component (cup). Repeated dislocations can be eliminated by correctly matching the size of the stem, the stem's offset, and the head size to the patients anatomy.