I'm in the process of recovering from a broken knee, which has left the leg partially paralyzed. I need a means of exercising my legs, for which the first thing which comes to mind is an Exercycle, but I live in such a small apartment that hasn't the room for it. What room there is is occupied by my adult trike.

The best solution that can imagine would be a set of stationary rollers to cradle the rear wheels, so that it could do double duty serving as an Exercycle. Problem is, I haven't been able to find any rollers that would serve the purpose. Anyone know of such a thing?