Has anyone had bad results from kyphoplasty? I had this surgery 4 months ago, and am wondering if it's possible that a balloon was left behind; I have a lump about egg-sized, just on the right side of the L2 vertebra that was given this procedure. It's painful, and doctors can't tell what's causing the pain. I've been told it may be a muscle spasm, but it isn't a spasm, it's constant. Anyone know of results like this? I'm completely puzzled and it's worrisome that if they can't feel it, they can't fix it. I don't want to live a long life with awful pain.