Table 3.
Indicators of the classification and medical tests to identify the cause of lower limb swelling after TKA
| Primary indicators: causes of swelling | Secondary and tertiary indicators: measurement indicators | Reasonableness score (x ± s, points) | Coefficient of variation (CV) |
|---|---|---|---|
| 1. Inflammation response | 4.82 ± 0.39 | 0.08 | |
| 1.1 Blood tests: routine blood test | 4.73 ± 0.45 | 0.09 | |
| 1.1.1 Leukocyte count | 4.45 ± 0.78 | 0.18 | |
| 1.1.2 Neutrophil count | 4.55 ± 0.66 | 0.14 | |
| 1.1.3 Platelet count | 4.82 ± 0.39 | 0.08 | |
| 1.2 Blood test: C-reactive protein (CRP) | 4.82 ± 0.39 | 0.08 | |
| 1.3 Blood test: erythrocyte sedimentation rate (ESR) | 4.64 ± 0.64 | 0.14 | |
| 1.4 Blood test: Calcitoninogen (PCT) | 4.36 ± 0.48 | 0.11 | |
| 1.5 Blood test: amyloid A (SAA) | 4.09 ± 0.90 | 0.22 | |
| 1.6 Blood test: Interleukin 1β | 4.27 ± 0.75 | 0.18 | |
| 1.7 Blood test: interleukin 6 | 4.27 ± 0.75 | 0.18 | |
| 2. Poor venous return | 4.82 ± 0.39 | 0.08 | |
| 2.1 Blood test: D-dimer + FDP | 4.82 ± 0.39 | 0.08 | |
| 2.2 Blood test: blood routine (platelet count) | 4.82 ± 0.39 | 0.08 | |
| 2.3 Blood test: four coagulation functions (APTT + PT + FG + TT) | 4.64 ± 0.48 | 0.10 | |
| 2.4 Color Doppler ultrasound scan: common iliac vein | 4.45 ± 0.78 | 0.18 | |
| 2.4.1 Maximum blood flow rate | 4.36 ± 0.88 | 0.20 | |
| 2.4.2 Whether under pressure | 4.45 ± 0.78 | 0.18 | |
| 2.5 Color Doppler ultrasound scan: common femoral vein | 4.64 ± 0.77 | 0.17 | |
| 2.5.1 Blood flow velocity | 4.36 ± 1.07 | 0.24 | |
| 2.5.2 Peak velocity of blood flow | 4.45 ± 0.78 | 0.18 | |
| 2.5.3 Average velocity of blood flow | 4.27 ± 1.05 | 0.25 | |
| 2.5.4 Diameter | 4.45 ± 0.89 | 0.20 | |
| 2.5.5 Blood flow | 4.18 ± 0.94 | 0.22 | |
| 2.5.6 Thrombus | 4.55 ± 0.66 | 0.14 | |
| 2.6 Ultrasound scan: popliteal vein | 4.73 ± 0.62 | 0.13 | |
| 2.6.1 Internal diameter | 4.36 ± 0.88 | 0.20 | |
| 2.6.2 Thrombus | 4.64 ± 0.64 | 0.14 | |
| 2.7 Ultrasound scan: superficial femoral vein | 4.64 ± 0.77 | 0.17 | |
| 2.7.1 Internal diameter | 4.45 ± 0.89 | 0.20 | |
| 2.7.2 Time, diameter, and regurgitation velocity of the first pair of valves in the superficial femoral vein during calm respiratory state and ValsalVa action | 4.45 ± 0.99 | 0.22 | |
| 2.7.3 Thrombus | 4.64 ± 0.64 | 0.14 | |
| 2.8 Ultrasound scan: deep femoral vein | 4.64 ± 0.77 | 0.17 | |
| 2.8.1 Backflow signal | 4.45 ± 0.89 | 0.20 | |
| 2.8.2 Backflow time | 4.45 ± 0.89 | 0.20 | |
| 3 Joint hematoma | 4.55 ± 0.78 | 0.17 | |
| 3.1 Ultrasound scan | 4.27 ± 0.75 | 0.18 | |
| 4 Muscle injury and healing | 4.27 ± 0.75 | 0.18 | |
| 4.1 Ultrasound scan: quadriceps muscle | 4.27 ± 0.75 | 0.18 | |
| 4.1.1 Thickness of the rectus femoris, middle femoris, and medial femoris muscles | 4.09 ± 0.79 | 0.19 | |
| 4.2 Blood test: serum myoglobin | 3.91 ± 0.79 | 0.20 | |
| 4.3 Blood test: serum creatine kinase | 3.91 ± 0.79 | 0.20 |