My CRPS started in both knees due to an accident (dashboard injury). My right knee kept bothering me most, so that was "tackled" first. They put me in a cast from ankle to hip to try and stabilize the knee, to see if that would work - it didn't (and I had blue feet by then) and I later had to have surgery on that knee. Surgery lasted 3H, they had to clean it out (debris) and fix a few things. After surgery my leg turned black. Back then they didn't know I had CRPS, which is why they still put a cast on and still did the surgery.

Almost 3 years in, I was diagnosed with CRPS, by that time it had spread to both legs throughout (toes to hips). The left knee was left like it was.

I wouldn't let the casts be put on if it isn't 100% necessary (for a broken bone or something like that). But that's just me.