The condition is not dangerous because the slippage almost never progresses once adulthood is reached. Therefore, the treatment is usually aimed towards simply relieving pain. I have had good luck treating this with braces and therapy for muscular strengthening to help restore stability to the lower spine.
Whenever she tried to walk to much, her back would begin to hurt, and then the pain would spread down her legs. If she sat down, the pain would go away. It got slowly worse over the months, to the point where she started giving up golf. That just wouldn’t do!