I broke both bones behind the wrist joint.
I developed a condition called Complex Regional Pain Syndrome. The way I understand it is that my body essentially tried to build its own cast. It wasn't evident until the cast was removed. It was necessary to stretch and break adhesions while working through the syndrome. My orthopedic team used occupational therapists for that purpose, hand wrenchers.
Even if I hadn't developed CRPS the OTs would have stretched and twisted the hand and wrist to restore strength and range of motion. Many in the treatment area had not developed that syndrome, it was just that I had a tougher "row to hoe" and a higher risk of developing a frozen hand.
We all were given 'home work', exercises to do daily. I was told that there is a window of time to achieve success, this work cannot be deferred.