Rehab question--pedal type?

[KnottedYet]

If you were my patient (and you're not, so take this with a grain of salt) I'd be telling you to use BMX pedals.

Huge contact area, very non-slip, nothing to fight.

Don't forget you've also got some muscle inhibition reflex arcs to counteract, along with the bony changes. I would stay away from any sort of retention system until all the muscles are back up to speed and the inhibition is completely gone. (your PT can tell you when that is) You've got a lot of muscles to wake up. They've been on vacation in that cast!

My concern with plain platform pedals is that the cheaper plastic ones can be slippery, and while you are working on regaining stabilization and corrective responses (the small muscle contractions and larger co-contractions that keep everything lined up) you do not want your feet slipping out from under you. If your LBS has some good grippy platforms of any type, that's what I'd be going for on the trainer. BMX pedals can run around $50, grippy platforms around $15.