I can say my hands were involved when PMR was active. I would wake up in the morning and open and close my hands. How stiff and sore my hands were predicted if it was going to be a good day or a bad day. I would tell this to my rheumatologist and she said it "comes with the territory." I was never sure if she meant PMR territory or the territory of inflammatory arthritis.

I found the following that suggests the hands can be involved in PMR:
https://rheumatology.org/patients/polymyalgia-rheumatica
"What Are the Signs/Symptoms?
The most common symptoms of polymyalgia rheumatica are widespread aching and stiff muscles. Symptoms can come on quickly, even overnight. Usually, you feel aches on both sides of your body. It may be hard to raise your arms over your shoulders. Hands and wrists may ache too. PMR aches may be worse in the morning and get better as the day goes by. Being inactive for a long time, like on a long car ride, may make stiffness worse. Stiffness and aches can be so severe that they cause people to have signs like:
Disturbed sleep
Trouble getting dressed, such as putting on socks
Problems getting in and out of a car or up from a sofa"