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Reliability on determining the footprint of the torn ACL on MRI1216Table 1. Intraobserver reliability per coordinate and in total: differences between the 1st and 2ndsession in mm.Observer X coordinate Y coordinate Z coordinate 3D DistanceMean difference (SD)ICC Mean difference (SD)ICC Mean difference (SD)ICC Mean difference (SD)Res-1 0.27 (1.77) 1.000 0.00 (2.06) 0.994 1.65 (1.78) 0.987 3.03 (1.95)Res-2 0.58 (2.40) 0.999 2.12 (2.35) 0.984 1.34 (3.02) 0.979 4.58 (2.29)Res-3 0.29 (1.60) 1.000 0.13 (2.70) 0.989 1.99 (1.91) 0.986 3.62 (2.00)OS-1 0.51 (1.20) 1.000 1.28( 1.54) 0.994 0.63 (1.97) 0.992 2.74 (1.49)OS-2 0.13 (1.74) 1.000 1.03 (2.01) 0.993 1.52 (2.37) 0.985 3.55 (1.73)OS-3 0.31 (2.70) 0.999 1.42 (1.43) 0.993 0.07 (1.33) 0.997 2.63 (2.45)MSK-1 0.58 (4.11) 0.998 2.26 (3.19) 0.976 2.78 (3.51) 0.961 6.29 (3.41)MSK-2 0.18 (1.89) 0.999 1.24 (2.19) 0.990 2.05 (3.17) 0.969 4.13 (2.52)Total 0.35 n.a. 1.15 n.a. 1.50 n.a. 3.82Res = resident orthopedic surgery, OS = senior orthopedic surgeon, MSK = fellowship trained musculoskeletal radiologist, SD = Standard Deviation, ICC = intraclass correlation coefficient, n.a.= not applicable. The x-axis represents the lateral-to-medial direction, the y-axis the anteriorto-posterior direction and the z-axis the caudal-to-cranial direction.Table 2. Interobserver reliability between groups per coordinate.ICC X coordinate ICC Y coordinate ICC Z coordinateRes vs MSK 0.999 0.970 0.953Res vs OS 0.999 0.960 0.952OS vs MSK 1.000 0.982 0.987Res = resident orthopedic surgery, OS = senior orthopedic surgeon, MSK = fellowship trained musculoskeletal radiologist, ICC = intraclass correlation coefficient. The x-axis represents the lateral-to-medial direction, the y-axis the anterior-to-posterior direction and the z-axis the caudal-to-cranial direction.Table 3. Interobserver reliability within groups per coordinate.Group ICC X-coordinate ICC Y- coordinate ICC Z-coordinateRes 0.999 0.962 0.982OS 1.000 0.995 0.961MSK 0.998 0.890 0.800Res = resident orthopedic surgery, OS = senior orthopedic surgeon, MSK = fellowship trained musculoskeletal radiologist, ICC = intraclass correlation coefficient. The x-axis represents the lateral-to-medial direction, the y-axis the anterior-to-posterior direction and the z-axis the caudal-to-cranial direction.Table 4. Mean 3D distance difference per groupGroup Mean 3D distance difference between first and second assessment Mean 3D distance difference between the observers Res 3.74 mm 6.57 mmOS 2.97 mm 5.62 mmMSK 5.21 mm 13.64 mmAll 3.82 mm 8.67 mmRes = resident orthopedic surgery, OS = senior orthopedic surgeon, MSK = fellowship trained musculoskeletal radiologist, All = all observers ICC = intraclass correlation coefficient, mm = millimeterMark Zee.indd 121 03-01-2024 08:56