Table 1 Henderson’s classification [12]
General category | Classification | Mode of failure | Description |
|---|---|---|---|
Mechanical | Type I | Soft-tissue failure | Limited function owing to insufficient musculo-ligamentous attachment (e.g., instability, tendon rupture, aseptic / superficial wound dehiscence |
Type II | Aseptic loosening | Clinical and radiological evidence of peri-prosthetic loosening | |
Type III | Structural failure | Breakage, fracture or wear related failure resulting in deficient supporting structure | |
Non-mechanical | Type IV | Infection | Infected reconstruction not amenable to retention |
Type V | Tumor progression | Recurrence or progression of tumor with endoprosthesis contamination |