18F-FDG PET vs. WBC/Marrow Imaging in 59 Joint Replacements
| Parameter | Sensitivity | Specificity | Accuracy | PPV | NPV |
|---|---|---|---|---|---|
| PPA | 1.00 (25/25) | 0.09 (3/34) | 0.47 (28/59) | 0.45 (25/56) | 1.00 (3/3) |
| FDG/Ma | 0.96 (24/25) | 0.35 (12/34) | 0.61 (36/59) | 0.52 (24/46) | 0.92 (12/13) |
| BPI | 0.52 (13/25) | 0.44 (15/34) | 0.47 (28/59) | 0.40 (13/32) | 0.56 (15/27) |
| T/B ratio | 0.36 (9/25) | 0.97 (33/34) | 0.71 (42/59) | 0.90 (9/10) | 0.67 (33/49) |
| WBC/Ma | 1.00 (25/25) | 0.91 (31/34) | 0.95 (56/59) | 0.89 (25/28) | 1.00 (31/31) |
PPV = positive predictive value; NPV = negative predictive value; PPA = any periprosthetic activity; FDG/Ma = FDG/marrow; BPI = BPI activity; T/B ratio = target-to-background ratio; WBC/Ma = labeled leukocyte/marrow.