Table 1.
Baseline characteristics of the study population
| Variable | Group A (Tourniquet group) (N = 50) |
Group B (Non-tourniquet group) (N = 50) |
Group C (Tourniquet in cementation group) (N = 50) |
p value* |
|---|---|---|---|---|
| Demographic characteristics | ||||
| Age (yr) | 68.44 ± 6.80 | 68.00 ± 7.11 | 68.66 ± 7.27 | 0.89 |
| Male sex (%) | 7 (14%) | 8 (16%) | 7 (14%) | – |
| Weight (kg) | 64.39 ± 8.16 | 62.66 ± 10.44 | 63.64 ± 11.27 | 0.67 |
| Height (cm) | 153.88 ± 21.49 | 157.06 ± 6.74 | 156.52 ± 7.08 | 0.46 |
| BMI (kg/m2) | 26.13 ± 2.63 | 25.34 ± 3.61 | 25.88 ± 3.51 | 0.42 |
|
ASA status I-II/≥III (No. of patients) |
35/15 | 38/12 | 36/14 | – |
| Diagnosis | ||||
| Primary OA | 50 | 50 | 50 | – |
| Preoperative laboratory values | ||||
| Preo. Hemoglobin (g/dl) | 134.84 ± 12.25 | 132.18 ± 15.10 | 129.50 ± 14.98 | 0.17 |
| Preo. Hematocrit (L/L) | 0.41 ± 0.04 | 0.41 ± 0.04 | 0.40 ± 0.04 | 0.82 |
| Preo. CRP (109/L) | 3.94 ± 3.13 | 3.29 ± 2.00 | 3.79 ± 2.30 | 0.41 |
| Preo. ESR (mm/L) | 21.88 ± 12.59 | 24.08 ± 13.21 | 28.32 ± 16.87 | 0.08 |
| Preo. IL-6 (pg/ml) | 4.28 ± 2.04 | 3.40 ± 2.19 | 3.76 ± 2.27 | 0.13 |
| Preo. CK (IU/L) | 81.52 ± 29.89 | 85.02 ± 39.71 | 74.06 ± 31.36 | 0.26 |
| Preoperative knee function | ||||
| VAS score (points) | 7.28 ± 0.97 | 7.32 ± 0.95 | 7.16 ± 0.87 | 0.67 |
| Range of motion | 94 ± 16 | 97 ± 20 | 95 ± 14 | 0.67 |
| HHS score (points) | 56.64 ± 4.24 | 55.10 ± 4.62 | 56.74 ± 4.04 | 0.11 |
Abbreviations: OA, osteoarthritis; CRP, C-reaction protein; ESR, erythrocyte sedimentation rate; IL-6, interleukin-6; CK, creatine kinase; HSS score, hospital of special surgery score
*The p value represents the result of one-way analysis of variance for independent means for continuous variables or the chi-square test for independent proportions that included the three groups