Table 3.
Comparison of imaging techniques in diagnosing periprosthetic knee infection using the z-test
| Imaging techniques compared | Sensitivity | Specificity | |||||
|---|---|---|---|---|---|---|---|
| Technique 1 | Technique 2 | Technique 1 | Technique 2 | Comparison (p value) | Technique 1 | Technique 2 | Comparison (p value) |
| BS | BS-LS | 0.93 | 0.87 | 0.39 | 0.56 | 0.82 | < 0.001 |
| LS | BS-LS | 0.88 | 0.87 | 0.89 | 0.77 | 0.82 | 0.44 |
| LS | BS | 0.88 | 0.93 | 0.34 | 0.77 | 0.56 | < 0.001 |
| LS | LS-BMS | 0.88 | 0.80 | 0.24 | 0.77 | 0.93 | < 0.001 |
| LS-BMS | BS | 0.80 | 0.93 | 0.08 | 0.93 | 0.56 | < 0.001 |
| LS-BMS | BS-LS | 0.80 | 0.87 | 0.47 | 0.93 | 0.82 | < 0.001 |
| AGS | BS | 0.90 | 0.93 | 0.60 | 0.95 | 0.56 | < 0.001 |
| AGS | BS-LS | 0.90 | 0.87 | 0.70 | 0.95 | 0.82 | 0.01 |
| AGS | LS | 0.90 | 0.88 | 0.72 | 0.95 | 0.77 | < 0.001 |
| AGS | LS-BMS | 0.90 | 0.80 | 0.21 | 0.95 | 0.93 | 0.47 |
| FDG-PET | BS | 0.70 | 0.93 | 0.06 | 0.84 | 0.56 | < 0.001 |
| FDG-PET | BS-LS | 0.70 | 0.87 | 0.11 | 0.84 | 0.82 | 0.73 |
| FDG-PET | LS | 0.70 | 0.88 | 0.01 | 0.84 | 0.77 | 0.21 |
| FDG-PET | LS-BMS | 0.70 | 0.80 | 0.30 | 0.84 | 0.93 | < 0.001 |
| FDG-PET | AGS | 0.70 | 0.90 | 0.02 | 0.84 | 0.95 | 0.02 |
BS = bone scintigraphy; LS = leukocyte scintigraphy; BMS = bone marrow scintigraphy; AGS = antigranulocyte scintigraphy; FDG-PET = fluorodeoxyglucose-positron emission tomography.