There is a high rate of success with the Vertiflex method. One study found that after 5 years, the treatment had an 84.1% rate of success in terms of function and symptoms, with over 70% improvement in leg pain and 74.7% without reoperation. According to another study, five years after the treatment, 90% of patients were still happy with it. However, 11.1% of Vertiflex patients in one controlled study had fractures of the spinous process that had not healed.