Table 3 Diagnostic performance of US and MRI for evaluating cartilaginous defects on different surfaces
Surface | TP# | TN# | FP# | FN# | Sensitivity (95%CI) (%) | Specificity (95%CI) (%) | Accuracy (95%CI) (%) | Crude predictive value (95%CI) (%) | Adjusted predictive value (%) | AUC (95%CI) | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
PPV | NPV | PPV | NPV | |||||||||
US Radiologist 1 | ||||||||||||
TS | 31 | 25 | 2 | 7 | 81.6 (69.3–93.9) (0.317) | 92.6 (82.7–102) (1.000) | 86.2 (77.8–94.6) (1.000) | 93.9 (85.5–102) (1.000) | 78.1 (63.8–92.4) (1.000) | 92.2 | 82.3 | 0.871 (0.791–0.951) |
MC | 20 | 22 | 3 | 20 | 50.0 (34.5–65.5) (0.005) | 88.0 (75.3–101) (0.046) | 64.6 (53.0–76.2) (0.058) | 87.0 (73.2–100) (0.310) | 52.4 (37.3–67.5) (0.251) | 81.8 | 62.0 | 0.690 (0.588–0.792) |
LC | 18 | 31 | 1 | 15 | 54.5 (37.6–71.5) (0.083) | 96.9 (90.8–103) (0.317) | 75.4 (64.9–85.9) (0.046) | 94.7 (84.7–105) (1.000) | 67.4 (53.8-80.9) (0.818) | 95.0 | 66.4 | 0.757 (0.666–0.849) |
US Radiologist 2 | ||||||||||||
TS | 35 | 24 | 3 | 3 | 92.1 (83.5–101) (0.025) | 88.9 (77.0–101) (0.317) | 90.8 (83.7–97.8) (0.424) | 92.1 (83.5–101) (1.000) | 88.9 (77.0–101) (0.315) | 90.0 | 91.3 | 0.905 (0.831–0.979) |
MC | 22 | 22 | 3 | 18 | 55.0 (39.6–70.4) (0.248) | 88.0 (75.3–101) (0.014) | 67.7 (56.3–79.1) (0.157) | 88.0 (75.3–101) (0.424) | 55.0 (39.6–70.4) (0.352) | 83.2 | 64.4 | 0.715 (0.613–0.817) |
LC | 20 | 30 | 2 | 13 | 60.6 (43.9–77.3) (1.000) | 93.8 (85.4–102) (0.317) | 76.9 (66.7–87.2) (1.000) | 90.9 (78.9–103) (0.424) | 69.8 (56.0–83.5) (1.000) | 91.3 | 68.8 | 0.772 (0.677–0.867) |
MRI | ||||||||||||
TS | 30 | 25 | 2 | 8 | 78.9 (66.0–91.9) | 92.6 (82.7–102) | 84.6 (75.8–93.4) | 93.8 (85.4–102) | 75.8 (61.1–90.4) | 92.0 | 80.3 | 0.858 (0.775–0.940) |
MC | 28 | 24 | 1 | 12 | 70.0 (55.8–84.2) | 96.0 (88.3–104) | 80.0 (70.3–89.7) | 96.6 (89.9–103) | 66.7 (51.3–82.1) | 95.0 | 74.8 | 0.830 (0.748–0.712) |
LC | 21 | 30 | 2 | 12 | 63.6 (47.2–80.0) | 93.8 (85.4–102) | 78.5 (68.5–88.5) | 91.3 (79.8–103) | 71.4 (57.8–85.1) | 91.7 | 70.5 | 0.787 (0.693–0.881) |