Fig. 2

Kaplan Meier curve of patients undergoing laminectomies and spinal fusions by age. These data represent cumulative probability of a surgery (y-axis) as a function of age (x-axis). At 10 years of age, 3.4% of patients had a laminectomy and 2.4% had a fusion surgery. At 20 years of age, 14.8% of patients had a laminectomy and 10.5% had a fusion surgery. At 40 years of age, 40.9% had a laminectomy and 24.1% had fusion surgery. At 60 years of age, 69.1% had a laminectomy and 39.9% had a fusion. At 80 years of age, 93.4% had a laminectomy with 55.0% had fusion surgery