Table 1.
Average cartilage reference properties and statistics on network performance, including Spearman’s rank correlation (ρ, *p < 0.001), root mean square error (RMSE), and normalized RMSE (NRMSE)
| Parameter | Cartilage thickness (mm) | Full-thickness PG content (OD) | Superficial PG content (OD) | Full-thickness collagen orientation angle (°) | Superficial collagen orientation angle (°) |
|---|---|---|---|---|---|
| Mean (range) | 0.82 (0.14–1.36) | 0.66 (0.04–1.41) | 0.37 (0.04–1.17) | 46.9 (10.1–77.2) | 17.1 (3.6–56.0) |
| Calibration (in vitro) | |||||
| ρ | 0.888* | 0.857* | 0.800* | 0.781* | 0.582* |
| RMSE | 0.108 | 0.208 | 0.174 | 10.967 | 7.994 |
| NRMSE | 8.8% | 15.3% | 15.4% | 16.4% | 15.2% |
| Validation (in vitro) | |||||
| ρ | 0.797* | 0.691* | 0.650* | 0.626* | 0.327* |
| RMSE | 0.141 | 0.274 | 0.220 | 13.111 | 9.495 |
| NRMSE | 11.5% | 20.1% | 19.5% | 19.6% | 18.1% |
| Test (in vivo) | |||||
| ρ | 0.596* | 0.676* | 0.613* | 0.574* | 0.316* |
| RMSE | 0.191 | 0.296 | 0.248 | 13.439 | 11.642 |
| NRMSE | 17.2% | 21.8% | 22.0% | 20.0% | 22.2% |