Many NSAIDs interfere with the development of a fusion, so they're really not a good idea. QMC will prescribe you a certain amount of diclofenac to aid your pain control while you are in hospital, but it's still limited and is only supplemental the the opiates - paracetamol is preferred for breakthrough pain and supplemental relief, because it does not affect fusion at all.
Diagnosed at 15 with 50° curve, but probably juvenile IS. Fused in kyphosis (by non-specialised ortho) with a/p surgery T10-L2 @ 21, posterior only revision surgery to correct kyphosis @ 29. Now 38 with further revision surgery and extension of fusion to sacrum required to correct residual kyphosis, restore lordosis and address spinal stenosis.