Table 3.
Subgroup analysis of the RTKA failure patterns including only full-cemented RTKA stems, divided into Co, Cy and Combi stem profiles
| Conical (Co) |
Cylindrical (Cy) |
Combination (Combi) |
All | Sign Co vs. Cy |
|
|---|---|---|---|---|---|
| All components | 36 | 58 | 6 | 100 | |
| All cemented components | 36 | 50 | 2 | 88 | 0.02 |
| Removed cemented components | |||||
| All | 35 | 45 | 2 | 82 | 0.19 |
| f | 17 | 23 | 1 | 41 | |
| t | 18 | 22 | 1 | 41 | |
| Causes of removed cemented implants | |||||
| PJI | 20 | 23 | 2 | 45 | 0.59 |
| Aseptic loosening | 9 | 21 | 0 | 30 | 0.05* |
| Malposition | 4 | 1 | 0 | 5 | 0.09 |
| Instability | 2 | 0 | 0 | 2 | 0.10 |
Co conical stem design, Cy cylindrical stem design, Combi combined stem designs, RTKA revision total knee arthroplasty, Re-RTKA Re-revision, PJI periprosthetic joint infection, f femoral, t tibial
*Differences are significant at the 0.05 level