This occurs when one vertebrae slips forward in relation to the vertebrae below it and may be asymptomatic or cause increased pain across the low back and into the buttocks and legs (including hamstring spams). This displacement of the vertebrae can press on nerves causing the pain. Spondylolisthesis is common in adolescent athletes with back pain and also in people over 65 that have experienced degeneration of their discs. Physical therapy to strengthen your back muscles and improve your stability is very important and the most common treatment technique.