Table 4.
Mean (SD) values of density-related and structure-related parameters in different KL grade groups from medial and lateral femur.
| Side | Parameter | KL0 (n=105-108) |
KL1 (n=28) | KL2 (n=27) | KL3 (n=30-31) | KL4 (n=7) | p-value | Post-hoc* |
|---|---|---|---|---|---|---|---|---|
| Medial | GV | 130 (21) | 137 (18) | 139 (20) | 147 (19) | 159 (26) | <0.001 | 0-2, 0-3, 0-4, 1-3, 1-4, 2-4 |
| GV’ | 86 (24) | 89 (24) | 88 (21) | 101 (23) | 111 (29) | 0.002 |
0-3, 0-4, 1-3, 1-4, 2-3, 2-4 |
|
| LBP/C | 7.51 (0.77) | 7.65 (0.52) | 7.41 (0.93) | 7.44 (0.70) | 6.86 (0.50) | 0.159 | - | |
| HILap | 0.71 (0.02) | 0.70 (0.02) | 0.70 (0.01) | 0.69 (0.02) | 0.70 (0.01) | <0.001 | 0-1, 0-2, 0-3 | |
| HILBP | 0.46 (0.02) | 0.45 (0.02) | 0.45 (0.02) | 0.45 (0.01) | 0.43 (0.01) | <0.001 |
0-3, 0-4, 1-3, 1-4, 2-4 |
|
| ELap | 7.13 (0.11) | 7.10 (0.10) | 7.02 (0.12) | 6.99 (0.11) | 6.92 (0.15) | <0.001 |
0-2, 0-3, 0-4, 1-2, 1-3, 1-4, 2-4 |
|
| ELBP | 6.72 (0.08) | 6.77 (0.09) | 6.80 (0.10) | 6.83 (0.06) | 6.90 (0.04) | <0.001 | 0-1, 0-2, 0-3, 0-4, 1-3, 1-4, 2-4 |
|
| Lateral | GV | 142 (18) | 147 (21) | 143 (14) | 139 (19) | 131 (18) | 0.196 | - |
| GV’ | 97 (14) | 99 (12) | 92 (12) | 93 (16) | 83 (14) | 0.032 | 0-4, 1-4 | |
| LBP/C | 6.53 (0.60) | 6.80 (0.61) | 6.94 (0.67) | 7.07 (0.60) | 6.81 (0.85) | <0.001 | 0-1, 0-2, 0-3 | |
| HILap | 0.69 (0.02) | 0.69 (0.02) | 0.68 (0.02) | 0.69 (0.02) | 0.68 (0.02) | 0.235 | - | |
| HILBP | 0.43 (0.01) | 0.43 (0.02) | 0.43 (0.01) | 0.43 (0.01) | 0.42 (0.01) | 0.689 | - | |
| ELap | 7.08 (0.11) | 7.07 (0.11) | 7.07 (0.09) | 7.06 (0.10) | 7.03 (0.07) | 0.792 | - | |
| ELBP | 6.75 (0.06) | 6.77 (0.06) | 6.79 (0.05) | 6.81 (0.05) | 6.83 (0.03) | <0.001 |
0-2, 0-3, 0-4, 1-3, 1-4 |
*
Differences between groups using Fisher’s LSD. Differences between groups using Bonferroni post-hoc test are bolded. GV = mean grayscale value, GV’ = soft tissue subtracted from GV, GVnorm = GV divided by the depth of the tibia, LBP/C = local binary patterns based contrast measure, HILap = homogeneity index from Laplacian-based image, HILBP = homogeneity index from LBP-based image, ELap = entropy from Laplacian-based image, and ELBP = entropy from LBP-based image.