From: Lumbar spine Schmorl's nodes; prevalence in adults with back pain, and their relation to vertebral endplate degeneration
Disc bulge/herniation
SN
Total
Present
Not present
Yes
30 (1.5%)
285 (14.7%)
315 (16.2%)
No
114 (5.9%)
1515 (78%)
1629 (83.8%)
144 (7.4%)
1800 (92.5%)
1944 (100%)