I had the anterior surgery 3 years ago and still have leg numbness and tingling in the thigh and down the leg to the foot. I know they says there's less chance of dislocation, but living with this is tiring. The nerves in the front are cut and, if they recover, it takes years. I also have L5-S1 spondylolisthesis and when my low back aches, that affects the leg as well. I'm just finishing PT for problems walking, stumbling, etc. and things are better but wish I hadn't done the anterior approach. i'm on a Mayo Clinic blog and people say the same thing and have heard this approach isn't being done as much. Good luck.