Some people may feel they're only comfortable sticking with one. But being an arthroplastic surgeon is complex. You need a variety, and there are benefits and down sides to every single implant in terms of correcting for deformities, problems, variations on normal anatomy. In order to give the best outcome for patients, the one or two implants that you're comfortable with may not correct those issues and that's why I feel the need to use a wide variety of implants. (14OTE)