From: Ultrasound-guided disc pain induction test for diagnosis of discogenic lumbar pain: a cross-sectional study
Location of tender disc (n = 65)
 L1/2
0
 L2/3
3
 L3/4
13
 L4/5
31
 L5/S1
18
Number of tender disc (n = 41)
 1
23
 2
12
 3
6