In a review for reasons of 100 disc prolapses reoperations we found in 62% a recurrence of disc prolapse at the same level, in 24% a recurrence at a different level, whereas in 14% we found that the nerve route was closely connected. We reoperated 44% in the first two years and 69% in the first five years. The time between the operations was prolonged if there was a short period of time for relief of pain after operation and a long period of preoperative symptoms. The variables of risk of a disk prolapse recurrence are recorded in a risk score, in which 64% of the patients belonged retrospectively to a risk group. The correlation between operation interval and score points showed that patients with short interval had high score ratings.