Major Differences between the Buechel-Pappas ankle and other devices on the market:

Mechanically superior to other ankle devices currently available

It is the best component geometry for a total ankle replacement that is currently available
The Buechel-Pappas ™ total ankle replacement has a bispherical shape on the talus. Its shape and bearing surfaces have been thoroughly developed and tested over a 20-year period to allow maximum motion with minimal constraint
There is a minimal amount of bone removed for insertion of the device. The other ankles on the market require more bone removal thus making fusion and/or revision surgery more difficult
The other ankle devices wear faster due to the flat geometry design (vs. the bispherical design) and their flat edges cause “loading problems” and increases the rate of wear of the device 
The major difference is the Buechel-Pappas implant has excellent, congruent, bispherical surfaces using a mobile bearing