Table 1.
Demographic and Operative Characteristics
| TM group | Ti group | Sleeve group | P value | |
|---|---|---|---|---|
| N = | 54 | 53 | 38 | |
| Age, mean years ± SD | 64.7 ± 10.1 | 68.7 ± 7.9 | 65.6 ± 7.5 | 0.25 |
| Sex ratio, M/F (%) | 38.9/61.1 | 37.7/62.3 | 47.4/52.6 | 0.62 |
| BMI, mean ± SD (kg/m2) | 34.7 ± 5.4 | 34.0 ± 6.9 | 35.0 ± 6.9 | 0.74 |
| ASA score (%) | 0.025 | |||
| 2 | 13.0 | 2.0 | 16.0 | |
| 3 | 81.5 | 98.1 | 81.6 | |
| 4 | 5.6 | 0 | 2.6 | |
| OR time, mean minutes ± SD | 214.7 ± 49 | 201.6 ± 61.6 | 192.6 ± 59.6 | 0.17 |
| Indication for revision (%) | ||||
| Aseptic loosening | 54.7 | 35.9 | 52.6 | 0.11 |
| PJI | 28.3 | 43.3 | 21.1 | 0.06 |
| Instability | 11.3 | 30.2 | 21.1 | 0.05 |
| Periprosthetic fracture | 5.7 | 1.9 | 2.6 | 0.54 |
| Osteolysis | 7.6 | 15.1 | 7.9 | 0.37 |
| Polyethylene wear | 3.8 | 7.6 | 7.9 | 0.64 |
| Malalignment | 0 | 7.6 | 2.6 | 0.08 |
| Extensor mechanism rupture | 0 | 13.2 | 7.9 | 0.02 |
| Stiffness | 3.8 | 11.3 | 0 | 0.07 |
| Patellar dysfunction | 2.0 | 0 | 0 | 1 |
| Number of previous TKA (%) | 0.57 | |||
| 1 | 42.6 | 34.6 | 42.1 | |
| 2+ | 57.4 | 65.4 | 57.9 | |
| Preoperative tibia stem fixation | < 0.001 | |||
| Cemented | 77.8 | 98.1 | 2.6 | |
| Hybrid | 18.5 | 1.9 | 5.3 | |
| Uncemented | 0 | 0 | 84.2 | |
| No stem | 3.7 | 0 | 7.9 | |
| Tibia revised only (%) | 7 | 8 | 8 | 0.35 |
| Both components revised (%) | 93 | 92 | 92 | 0.35 |
| Level of constrain (%) | 0.02 | |||
| Hinge | 28 | 49 | 26 | |
| Non-hinge | 72 | 51 | 74 | |
| Follow-up, mean (months) ± SD | 29 ± 14.8 | 21.6 ± 9.7 | 41.1 ± 16.6 | < 0.001 |