Structure | Time | Number of disc levels | Decrease | Unchanged | Increase | Fluctuating |
---|---|---|---|---|---|---|
Lumbar disc herniations | Four-year change | 140 | 19 (14 %) | 114 (81 %) | 7 (5 %) | - |
Eight-year change | 80 | 14 (17,5 %) | 52 (65 %) | 10 (12,5 %) | 4 (5 %) | |
Dural sac | Four-year change | 140 | 25 (18 %) | 110 (78,5 %) | 5 (3,5 %) | - |
Eight-year change | 80 | 23 (29 %) | 49 (61 %) | 4 (5 %) | 4 (5 %) | |
Disc height | Four-year change | 140 | 10 (7 %) | 127 (91 %) | 3 (2 %) | - |
Eight-year change | 80 | 13 (16 %) | 62 (78 %) | 4 (5 %) | 1 (1 %) |