This is probably not going to help you much. I hurt my wrists back in 1993 after a minor fall at work. Just thought I had sprained the left wrist but it didn't settle down. X-rays showed nothing other than a previous (unknown) break had 'healed nicely'.
I had lost all rotational movement, so putting your elbow on a chair arm, i was unable to rotate my hand from Palm up to Palm down. A physio decided to concentrate on getting that movement back. I spent the next 15 years with my wrist in a permanent support preventing that movement because it caused my wrist to dislocate 20-30 times a day. It was 7 years before I could ride a bike again and even that had to be chosen carefully and modified to my needs.
It had taken 11 operations some with 4 or 5 different procedures happening in the same op for me to retain most use of the wrist and hand and it to stop dislocating.
I'm guessing physio have given you some exercises? Make sure you do them faithfully bit do not over do them. Also if you are under a physio have they given you the go ahead to restart cycling? One of the things the various physios I was under suggested was that i take my pain meds an hour before I tried cycling and kept distances short. It took a while, ok years, but with patience and some hard work and tears i was eventually able to set off the cycle around the world but only on a custom fitted bike. A 2 week tour the previous summer on my commuter mtb proved to me the value of a custom fitted bike.
Patience is probably what you need right know and those finger exercisers that climbers use... They are great for fiddling with whilst watching TV and building up strength slowly. The
gripmaster ones they curiously helped my wrists over time.
She'd sooner have me a bit fitter though.............................and able to walk 
