I saw this picture the other day while researching frozen shoulder. It really hit me that PD is always described as problems being caused by dopamine cells dying in your brain and the subsequent lack of dopamine affecting your body.
If you look at this picture and see the difference between the normal shoulder and the frozen shoulder, it seems that something more is at work here. Maybe I am wrong, and a lack of dopamine causes shoulder inflammation.
I'm just thinking, with my HS degree, that whatever stack of protocols we have need to include something to address this inflammation (I'm guessing it is not limited to the shoulder).