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Table 1 Categorization of failure modes according to Henderson [17]
| Category | Type | Subgroup |
|---|---|---|
| Mechanical | I. Soft tissue failure | A: instability due to tendon/muscle rupture B: aseptic wound dehiscence |
| II. Aseptic loosening | A: <2 years after implantation B:>2 years after implantation | |
| III. Structural failure | A: prosthetic failure B: periprosthetic fracture | |
| Non-mechanical | IV. Periprosthetic infection | A: <2 years after implantation B:>2 years after implantation |
| V. Tumor progression with contamination of prosthesis | A: soft tissue tumor B: bone tumor |
