From: Correlation between multifidus fatty atrophy and lumbar disc degeneration in low back pain
Atrophy grade
L4/L5
L5/S1
Total Multifidus
%
Normal (0–10%)
5
2
7
10
Mild (10–30%)
21
22
43
61.4
Moderate (30–50%)
8
18
25.7
Severe (> 50%)
1
2.9