Table 2.
Intraobserver reliability (Pearson's or Spearman's correlation according to the normality of the data distribution and Cronbach's alpha) for the 2D and 3D measurements
| Intraobserver reliability | Pearson’s correlation index | Spearman’s rank correlation coefficient | Cronbach's alpha | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Observer 1 | Observer 2 | Observer 1 | Observer 2 | Observer 1 | Observer 2 | |||||||
| r | p-Value | r | p-Value | rho | p-Value | rho | p-Value | Alpha | IC95% | Alpha | IC95% | |
| 2D measurements | ||||||||||||
| Transepicondylar distance (TD) | – | – | – | – | 0.989 | < 0.0001 | 0.992 | < 0.0001 | 0.9942 | 0.9906 | 0.9946 | 0.9913 |
| Medial femoral condyle AP dimension | 0.8989 | < 0.0001 | 0.9321 | < 0.0001 | – | – | – | – | 0.9468 | 0.9144 | 0.9649 | 0.9436 |
| Lateral femoral condyle AP dimension | 0.9715 | < 0.0001 | 0.8697 | < 0.0001 | – | – | – | – | 0.9856 | 0.9768 | 0.9303 | 0.8880 |
| Proximal tibia ML dimension | – | – | – | – | 0.967 | < 0.0001 | 0.925 | < 0.0001 | 0.9835 | 0.9735 | 0.9369 | 0.8986 |
| Medial tibial plateau AP dimension | 0.8525 | < 0.0001 | 0.8250 | < 0.0001 | – | – | – | – | 0.9204 | 0.8721 | 0.9041 | 0.8458 |
| Lateral tibial plateau AP dimension | – | – | – | – | 0.913 | < 0.0001 | 0.904 | < 0.0001 | 0.9087 | 0.8533 | 0.9514 | 0.9219 |
| Tibial PCL insertion-trochlearcartilage distance | 0.9549 | < 0.0001 | 0.9515 | < 0.0001 | – | – | – | – | 0.9769 | 0.9629 | 0.9752 | 0.9601 |
| Patellar tendon length | – | – | 0.8236 | < 0.0001 | 0.735 | < 0.0001 | – | – | 0.8925 | 0.8273 | 0.9033 | 0.8445 |
| 3D measurements | ||||||||||||
| Intrarticular length of ACL graft | 0.6103 | < 0.0001 | 0.7075 | < 0.0001 | – | – | – | – | 0.758 | 0.6111 | 0.8287 | 0.7246 |
| Outside-in femoral tunnel length | 0.8221 | < 0.0001 | – | – | – | – | 0.915 | < 0.0001 | 0.9023 | 0.843 | 0.9433 | 0.9089 |
| Outside-in anatomic ACL reconstruction | 0.8918 | < 0.0001 | – | – | – | – | 0.869 | < 0.0001 | 0.9428 | 0.9081 | 0.9206 | 0.8723 |
| Saragaglia/Yamaguchi techniques | 0.8654 | < 0.0001 | 0.7654 | < 0.0001 | – | – | – | – | 0.9278 | 0.884 | 0.7699 | 0.6302 |
| Anatomic anterolateral ligament reconstruction | 0.6953 | < 0.0001 | 0.2675 | 0.0603 | – | – | – | – | 0.8202 | 0.7111 | 0.4221 | 0.0712 |
| Lateral extrarticular tenodesis (anatomical femur) | 0.6911 | < 0.0001 | 0.2834 | 0.0461 | – | – | – | – | 0.8173 | 0.7064 | 0.4282 | 0.1025 |
| Lateral extrarticular tenodesis (non-anatomical femur) | 0.5914 | < 0.0001 | 0.6043 | < 0.0001 | – | – | – | – | 0.7432 | 0.5973 | 0.7533 | 0.6035 |
| Over the top femoral position ACL reconstruction | 0.7718 | < 0.0001 | 0.7601 | < 0.0001 | – | – | – | – | 0.8712 | 0.793 | 0.8637 | 0.7809 |
| Marcacci technique | – | – | – | – | 0.859 | < 0.0001 | 0.800 | < 0.0001 | 0.8180 | 0.7075 | 0.8823 | 0.8108 |
AP anteroposterior, ML mediolateral, PCL posterior cruciate ligament, ACL anterior cruciate ligament