Table 5.
Reliability of each image type used to detect intra-articular hardware.
| View | Gold Standard |
Raters | Kappa (95% CI) | AUC (95% CI) | Sn (95% CI) Sp (95% CI) |
||
|---|---|---|---|---|---|---|---|
| absent | present | total | |||||
| PA | absent | 64 | 10 | 74 | 0.80 (0.70, 0.90) | 90% (85%, 95%) | Sn=93% (85%, 98%) Sp=86% (77%, 93%) |
| present | 5 | 70 | 75 | ||||
| total | 69 | 80 | 149 | ||||
| Lateral | absent | 40 | 35 | 75 | 0.15 (−0.01, 0.30) | 58% (50%, 66%) | Sn=61% (49%, 72%) Sp=53% (41%, 65%) |
| present | 29 | 46 | 75 | ||||
| total | 69 | 81 | 150 | ||||
| 11° PA | absent | 60 | 15 | 75 | 0.71 (0.59, 0.82) | 86% (80%, 91%) | Sn=91% (82%, 96%) Sp=80% (69%, 88%) |
| present | 7 | 68 | 75 | ||||
| total | 67 | 83 | 150 | ||||
| 22° Lateral |
absent | 71 | 4 | 75 | 0.57 (0.45, 0.70) | 79% (73%, 85%) | Sn=63% (51%, 74%) Sp=95% (87%, 99%) |
| present | 28 | 47 | 75 | ||||
| total | 99 | 51 | 150 | ||||
| Neutral Movie |
absent | 72 | 3 | 75 | 0.89 (0.82, 0.97) | 95% (91%, 98%) | Sn=93% (85%, 98%) Sp=96% (89%, 99%) |
| present | 5 | 70 | 75 | ||||
| total | 77 | 73 | 150 | ||||
| 22° Tilt Movie |
absent | 68 | 7 | 75 | 0.81 (0.72, 0.91) | 91% (86%, 95%) | Sn=91% (82%, 96%) Sp=91% (82%, 96%) |
| present | 7 | 68 | 75 | ||||
| total | 75 | 75 | 150 | ||||
| PA/Lat | absent | 57 | 18 | 75 | 0.69 (0.58, 0.81) | 85% (79%, 90%) | Sn=93% (85%, 98%) Sp=76% (65%, 85%) |
| present | 5 | 70 | 75 | ||||
| total | 62 | 88 | 150 | ||||
| 11° PA / 22° Lat |
absent | 67 | 8 | 75 | 0.81 (0.72, 0.91) | 91% (86%, 95%) | Sn=92% (83%, 97%) Sp=89% (80%, 95%) |
| present | 6 | 69 | 75 | ||||
| total | 73 | 77 | 150 | ||||
Sn = sensitivity, Sp=specificity, AUC=area under ROC curve, 95%CI=confidence interval