I just found this while checking in with my fellow Hippies (Surfacehippy.info). This is what is in my hip. These guys have been making this implant for 10 years or more and they have the lion's share of the market. The parent company (Smith&Nephew) have been around since 1856 and they are the largest ortho prosthesis maker in the world. The designers of the BHR (Treacy and McMinn) are in Birmingham, England, thus the name Birmingham. Some of the other metal-on-metal prostheses are the Wright Medical Conserve Plus, ASR Resurfacing, Cormet by Biomet, Duron by Zimmer, and there are probably a few others out there, that I don't know of.