From: Fat in the lumbar multifidus muscles - predictive value and change following disc prosthesis surgery and multidisciplinary rehabilitation in patients with chronic low back pain and degenerative disc: 2-year follow-up of a randomized trial
Rehabilitation (n = 63)
Surgery (n = 63)
Improvement in 1 level
1a
0
No change
61
56
Deterioration in 1 level
1b
5c
Deterioration in 2 levels
2d