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Indication for revision after new indications for revision were added at the Finnish Arthroplasty Register data content revision in May 15, 2014. Values are number (%)
| Main reason for revision | M2a group | Reference group |
|---|---|---|
| Aseptic loosening | ||
| Cup | 2 | 2 |
| Stem | 0 | 2 |
| Cup osteolysis | 1 | 7 |
| Liner wear | 0 | 17 |
| Liner breakage | 0 | 1 |
| Infection | 1 | 2 |
| Dislocation | 1 | 10 |
| Cup malposition | 0 | 3 |
| Periprosthetic femur fracture | 2 | 8 |
| Adverse reaction to metal debris | 2 | 0 |
| Missing data | 1 | 10 |
