The amount of float you need depends only on YOUR KNEES. The knee injury may not make any difference.

Check the cleats that came with the pedals, if there are 2 sets, then the small cleats have little to no float and the larger cleat has a reasonable amount of float for most riders.

Speedplay frogs probably still have the most float for any pedal system.


The cleats in the linked picture are the ones that have float.
http://www.amazon.com/dp/B001CDXGEQ/...SIN=B001CDXGEQ

PS: You do not need to use the platform that is also in the picture with mountain shoes.