Whats the difference between GenuTrain and GenuTrain P3?
A. GenuTrain P3 was specifically designed to treat patellar subluxation (shifting). Therefore, the silicone insert in the P3 has a tracking guide to prevent the patella from shifting out of place. It is also a little bit longer and has 4 stays, rather than 2, because the silicone insert is a lot larger than the GenuTrain insert.