Table 2.
Demographics and epidemiological data of all ReRTKA included in the study, divided into Co, Cy and Combi stem profiles
| Conical (Co) | Cylindrical (Cy) | Combination (Combi) | All | Sign Co vs. Cy |
|
|---|---|---|---|---|---|
| Age | 67.7 ± 9.7 | 67.9 ± 9.1 | 58 ± 27.5 | 67 ± 11.5 | 0.99 |
| Gender (females) | 12 | 13 | 2 | 27 | 0.84 |
| Knees components (f & t) | 18 | 29 | 3 | 50 | 0.02* |
| 36 | 58 | 6 | 100 | ||
| Component fixation | |||||
| Cemented | 36 | 50 | 2 | 88 | 0.49 |
| Press fit | 0 | 6 | 3 | 9 | 0.05* |
| Hybrid | 0 | 2 | 1 | 3 | 0.26 |
| Component removals | |||||
| All | 35 | 52 | 5 | 92 | 0.71 |
| f | 17 | 28 | 2 | 47 | 0.73 |
| t | 18 | 24 | 3 | 45 | 0.72 |
| Causes of removed component | |||||
| PJI | 20 | 26 | 2 | 48 | 0.65 |
| Aseptic loosening | 9 | 23 | 0 | 32 | 0.16 |
| Malposition | 4 | 3 | 2 | 9 | 0.36 |
| Painful knee | 0 | 0 | 1 | 1 | |
| Instability | 2 | 0 | 0 | 2 | 0.08 |
| Previous RTKAs | |||||
| 1R | 2 | 6 | 0 | 8 | 0.43 |
| 2R | 2 | 3 | 1 | 6 | 0.93 |
| 3R | 5 | 11 | 2 | 18 | 0.56 |
| > 3R | 9 | 9 | 0 | 18 | 0.30 |
Co conical stem design, Cy cylindrical stem design, Combi combined stem designs, RTKA revision total knee arthroplasty, PJI periprosthetic joint infection, 1R one previous revision, 2R two previous revisions, 3R three previous revisions, > 3R more than three previous revisions, 1 s one-stage exchange RTKA, 2 s two-stage exchange RTKA, f femoral, t tibial
*Differences are significant at the 0.05 level