Table 4. Evaluation results of indirect MRI signs of ACL injuries.
| Indirect MRI signs | Sensitivity | Specificity | χ2 | P value |
|---|---|---|---|---|
| Posterior cruciate ligament angle | 53.03 (35/66) | 91.67 (1/12) | 8.163 | 0.004 |
| Posterior cruciate ligament index | 56.06 (37/66) | 100.00 (0/12) | 12.798 | 0.001 |
| Bone contusion | 54.55 (36/66) | 83.33 (2/12) | 5.831 | 0.016 |
| Notch sign | 36.36 (24/66) | 100.00 (0/12) | 6.303 | 0.012 |
| Anterior tibial displacement | 51.52 (34/66) | 83.33 (2/12) | 4.962 | 0.026 |
| Meniscus exposure sign of posterior ankle | 27.27 (18/66) | 100.00 (0/12) | 4.255 | 0.039 |
| Hollow ankle socket sign | 46.97 (31/66) | 91.67 (1/12) | 6.265 | 0.012 |
| Lateral collateral ligament monolayer display | 25.76 (17/66) | 100.00 (0/12) | 3.952 | 0.047 |
ACL, anterior cruciate ligament; MRI, magnetic resonance imaging.