Table 4 The results of ROC analysis of the SP-ET index and Insall–Salvati ratio
From: The SP-ET index is a new index for assessing the vertical position of patella
AUC (95%CI) | Abnormal MRI cutoff value | |
|---|---|---|
SP-ET index | 0.803 (0.740–0.856) | > 0.833 (se = 0.859, sp = 0.667) |
Insall–Salvati ratio | 0.699 (0.629–0.762) | > 1.125 (se = 0.424, sp = 0.911) |
z value | 2.216 | – |
p value | 0.027 | – |