Comment by m463
I broke an arm and the emergency room couldn't see it on the x-ray and gave me a sling to wear.
A couple days later I got to see an actual bone doctor and he got the x-ray and immediately pointed to the fracture.
What surprised me was that he said not to use the sling, because it would lose my range of motion.
"Keep moving your arm, use the entire range of motion, and let pain be your guide."
Frozen shoulder isn't fun. I had it for almost 2 years - from onset to the point where my shoulder mobility was pretty much back to normal. That's probably why your doc recommended to keep the arm in motion.