Your scar will not tear, though it may not be as elastic as normal skin tissue and a little discolored. Really nothing to worry about in the long run. Their doing some medical skin bonding, rather than stiching, in the U.S. now. This can improve any future scarring concerns. Don't know what they do in Aussieland though. As you know, there can't be much more of a painfull experience than back problems and even the recovery from them.
I had major surgery on my L-4 & L5 disc at 21 years old and there is just a short line scar, which turns darker when out surfing and such. No big deal. I did a lot of GoodMorning when building up the strength of the low back after the operation. This really helped. Took a couple of month's to get back to normal for lifting heavy again. Good Luck.
