Table 5 Evaluation of degree of disc degeneration
Degree of degeneration | Grade II | Grade III | Grade IV | Grade V |
|---|---|---|---|---|
Disc number | 2 | 23 | 83 | 50 |
area ratio of endplate | 13.89% ± 2.14% | 32.23% ± 15.28% | 36.93% ± 16.19% | 54.24% ± 18.23%** |
area ratio of sagittal | 5.60% ± 2.15% | 19.66% ± 9.68% | 20.44% ± 11.24% | 28.14% ± 9.65%** |
HU value of endplate | 440.30 ± 42.14 | 544.74 ± 157.17 | 560.54 ± 161.91 | 609.58 ± 151.46 |