It is my belief that all of the RSD is connected to pressure.
Look at the original cause be it a fracture or an operation both are pressure induced, either to cause the fracture or break the skin to operate.
My blood vessels have white lumps in them and the main one is distorted hand down and the blood fills up the hand pressure.
The swelling most of us suffer causes pressure internally and by stretching the skin
Look at all of our hypersenitivites and they have one thing in common.
Sound waves cause vibrations in the ear drum pressure
Wind against the skin pressure
Vibrations from the road surface pressure
Hot and cold cuases slight changes on the skin surface pressure
Solar storms pressure even the touch of a sunray on my hand causes pressure and extreme pain
Changes in the weather pressure
When I flew as the plane went up so did the cabin pressure and the pain was so bad I came very close to walking out into the sea rather than facing the flight back
Some people have claimed to have got amazing results from HBOT breathing pure oxygen under pressure. others nothing
What it really needs is a full medical trial of HBOT to see if the ones who get better are all under the same amount of pressure or if it varies and is hit and miss