Table V.
Causes of revision.
| Aetiology of arthritis | COFAS type | Preoperative coronal plane deformity (tibio-talar angle) | Postoperative coronal alignment | Initial lucency? | Time to revision, mths | Reason for revision | Action |
|---|---|---|---|---|---|---|---|
| Osteoarthritis | 4 | 8° valgus | 10° varus | No | 5 | Poor bone stock, Intraoperative fracture, lost anterior cortical contact and continued to dorsiflex | Revised to INBONE |
| Post-traumatic | 4 | 5° varus | 0° | Nil initially Hazy tibial lucency < 2 mm at 6/12 months |
13 | Aseptic loosening tibia | Two stage revision to INBONE |
| Osteoarthritis | 2 | 15° varus | 2° varus | No | 4 | Deep infection | Two stage revision, awaiting IMBONE |
| Post-traumatic | 2 | 12° varus | 4° varus | No, tibial radiolucency at 9 months | 18 | Aseptic loosening tibia | Two stage revision, awaiting INBONE |
| Osteoarthritis | 1 | 0° | 0° | Yes | 19 | Aseptic loosening tibia | Two stage revision, awaiting INBONE |
COFAS, Canadian Orthopaedic Foot and Ankle Society.