Without spoiling who won the World Cup for those who might not know yet, Zidane headbutted another player in today's match a few hours ago and someone has already created this mortal kombat graphic remix:
(found via the TFD LJ Feed - the LJ page this was posted on had "objectionable material" and they didn't attribute it either, so I didn't link it.)
I have found it helpful to do the stretching exercises my physical therapist recommends. Do some core strengthening exercises, such as the ones highlighted at The Mayo Clinic. By keeping your core strong, your back won't put itself in a position to cause that sciatica pain you are having.