From: Correlation between multifidus fatty atrophy and lumbar disc degeneration in low back pain
Pfirrmann Grade
L4/L5
L5/S1
Total Discs
%
I
2
1
3
4.3
II
8
7
15
21.4
III
18
11
29
41.4
IV
5
13
25.7
V
7.2