Spondylolisthesis is a condition in which damage to the bones or joints in the spine causes a vertebra to slip forward. This, in turn, may cause a nerve root to be pinched or irritated, radiating pain to the legs and feet. Causes of spondylolisthesis vary based on age, lifestyle and heredity. Children may suffer from the condition as a result of injury (especially in sports like football, gymnastics, wrestling, weightlifting and track and field), and rapid growth during adolescence may also be a contributing factor. If this condition is present in the family medical history, any age is at risk.