Appendix Table 1.

Differences in Area Under ROC Curves (AUC) of Medial Tibiofemoral Distance Based on Ultrasonographic and Fluoroscopic Evaluation for Each Successive Injury State

Medial Tibiofemoral Distance at 20° of Knee Flexion Under Valgus Force	AUC for Ultrasound	95% CI	AUC for fluoroscopy	95% CI	Difference in AUC	P Value
Stage 0 vs stage 1	0.98	0.77-1.0	0.96	0.88-1.0	0.01	.737
Stage 1 vs stage 2	0.89	0.64-0.99	0.97	0.74-1.0	0.1	.207
Stage 2 vs stage 3	0.88	0.63-0.99	0.90	0.71-1.0	0.02	.829
Stage 3 vs stage 4	0.84	0.58-0.97	0.86	0.65-0.99	0.02	.848
Stable vs unstable injuries	0.97	0.82-1.00	0.98	0.83-1.0	0.01	.220

ACL, anterior cruciate ligament; AUC, area under the curve; CI, confidence interval; dMCL, deep medial collateral ligament; %, percentage; POL, posterior oblique ligament; sMCL, superficial medial collateral ligament; stable injuries, combined stage 0 and stage 1; stage 0, intact state; stage 1, transectioning of sMCL; stage 2, transectioning of sMCL and dMCL; stage 3 transectioning of sMCL, dMCL, and POL; stage 4, transectioning of sMCL, dMCL, POL, and ACL; unstable injuries, stage 2.