does anyone know what percent of patients erosion and slippage occur in? Are there any ways to prevent these from happening?

I don't believe either is very common. I've only read a very few posts where either was diagnosed.

The key is to follow your doctor's instructions as far as your eating plan, EXPECIALLY in the weeks immediately after surgery. Erosion is not something you can control, I don't think. I've read one or two posts where people said that was their problem but neither actually knew what had caused it. I think the improvements to the Lap Band to the Lap Band AP were aimed at further limiting erosion.

Slipping can occur as a result of vomiting. PBing is not vomiting. But even very frequent PBs could cause issues. But PBing is pretty much "Operator Error", usually resulting from eating too fast, taking bites that are too big, not chewing well enough or eating (particularly) meat that is very dry.

Perhaps someone who has dealt with either problem can shed more light.

Slippage is aroung 3-5 % and is usually resolved with either "unfilling" the band for a time then starting over, or revision surgery. Erosion occurs in about 1% of all cases. (at least per this web site I found)

www.wlshelp.com

Slippage can be caused from overeating and vomiting. Usually slipped bands require surgery to reposition them properly, remove the stitches and restitch.