Table 2.
Registries by failure modes (%). N, qualified for revision surgery. *First number is overall revision percentage, second number is early revision (<3 months from primary procedure) percentage.
| Registry | N | Aseptic Loosening | Wear; lysis | Instability | Infection | Arthro-fibrosis, stiffness | Patello-femoral or extensor mechanisma | Peri-prosthetic fracture | Mal-alignment | Pain | otherb |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Norway38 | 8147 | 20 | 2.8 | 14.9 | 16.2 | – | 3.8 | 3 | 6.7 | 24.7 | – |
| Sweden37 | 4685 | 28 | 5 | 15 | 30 | – | 13 | 3 | – | – | 6 |
| Germany47 | 13378 | 25 | 5.7; 1.1 | 8.9 | 14.7 | 4 | 4.2 | 3 | 1.8 | – | 31.6 |
| Switzerland48 | 8340 | 34.5 | 5.8 | 15.9 | 17 | 4.9 | 25.7 | 2.8 | 10.4 | 12.7 | 11.7 |
| United Kingdom49 | 60294 | 37 | 12.9 | 15.9 | 15.7 | 5.4 | 12.1 | 3.8 | 6.9 | 14.7 | 14.6 |
| Australia50 | 24722 | 25 | 3.9 | 8.1 | 23.3 | 3.6 | 15.5 | 3 | 2.2 | 8.2 | 7.3 |
| New Zealand51 | 3652 | 35.9 | – | – | 26.6 | – | 25.1 | 3 | – | 29.4 | – |
| United States52 | 49491 | 25/2.8* | 2.9/0.3* | 12.6/6.7* | 20.5/63* | – | – | 2.3/3.9* | – | – | 37/23* |
| Japan53 | 1679 | 44.4 | 12 | 13.5 | 32 | 3 | – | 2.2 | – | – | 16.8 |
The three most common reasons are in bold.
a
Includes patellar dislocation, resurfacing due to progression of osteoarthritis, erosion, failure, and patellar pain.
b
Includes incorrect sizing, metal sensitivity, implant breakage, and other or missing reasons.