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Fascia Tightening ??
I am so sorry about your situation.
There is a hand transplant surgeon I reviewed this with as well as another vascular surgeon and two hand surgeons.
All felt that there is nothing to do in terms of fascial tightening. All agreed that you should evaluate for proximal venous obstruction at the neck and upper extremity.
Note that after fascial release, the compartment will eventually scar down. And re-tightening the fascia will only re-exacerbate your issue.