Table 1.
Comparison of the demographic and clinical data between the dynamic and static spacer groups.
| Variable | Dynamic spacer group | Static spacer group |
|---|---|---|
| Number of knees | 34 | 81 |
| Age (years)* | 62 (59–65) | 61 (58–64) |
| Body mass index (kg/m2)* | 31.25 (28.60–33.90) | 36.70 (35.12–38.28) |
| Spacer duration (days)* | 93 (74–112) | 107 (82–132) |
| Preoperative Knee Society objective score (points)* | 62 (58–66) | 73 (71–75) |
| Preoperative flexion contracture > 5° | ||
| Number | 7 | 4 |
| Flexion contracture (°)† | 11 (5–40) | 10 (5–20) |
| Preoperative ROM (°)* | 99 (93–104) | 83 (89–97) |
| Tibial bone loss (number of knees) | ||
| Type 1 | 17 (50%) | 30 (38%) |
| Type 2a or 2b | 13 (38%) | 38 (46%) |
| Type 3 | 4 (12%) | 13 (16%) |
| Femoral bone loss (number of knees) | ||
| Type 1 | 18 (53%) | 16 (20%) |
| Type 2a or 2b | 16 (47%) | 49 (60%) |
| Type 3 | 0 | 16 (20%) |
| Type 1 tibial and femoral (number of knees) | 16 (47%) | 16 (20%) |
| Type 2 or 3 tibial or femoral (number of knees) | 18 (53%) | 65 (80%) |
* Values are expressed as mean, with 95% confidence interval in parentheses; †values are expressed as mean, with range in parentheses.