Figure 1

The Mallory-Head Porous femoral component (Biomet, Warsaw, Indiana) is a collarless, titanium, tapered device with plasma-spray coating on the distal third, grit blasted on the middle third, and satin-textured on the distal third. On the left is shown the component as it was first introduced in August 1984, with the plasma-spray coating covering only 62.5% of the proximal third, on the medial surfaces only. In the middle is shown the standard component with the plasma-spray coating extended circumferentially as a barrier against particulate debris, beginning in January 1987 and as currently available. On the right is shown the component with the option of hydroxyapatite coating applied over the plasma-spray coating on the proximal third, which was first available in November 1988. In addition, a lateralized offset option became available in March 2000.