Hi, I am an active, healthy 67 year old male in good shape but with a stenosis condition that I have been aware of for ten years. I have always successfully managed any pain with exercise (about an hour in the gym everyday) allowing me to ski, hike, and lift weights. Recently the inside of my right lower leg has gone numb and an MRI reveals that my stenosis has grown worse over the ten years. While all discs are in tact, the L4 and L5 are sliding with respect to each other, narrowing the spinal canal. What is the least invasive procedure that will allow me to continue with sports, hiking and weight lifting.