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 |