I used Arnica tablets internally before and after FFSsurgery, and arnica cream directly on the skin for my FFS, and I looked like a car wreck regardless. Hard to say if Arnica made any difference.
I didn't even bother with Arnica for SRS. My health is good, and I just didn't worry about it, one thing less on the checklist of things to have to think about. No real issues after surgery, there was swelling, but I don't think there is any way to avoid that.
I have a revision coming up in January (SRS revision).. and just plan on keeping up the healthy diet and vitamins that I take regularly anyway... my blood tests come back superb at each doc appt.
Good Luck!
Melan