Table 1.
Paprosky classification of acetabular bone loss.
| Type | Femoral head migration | Kohler’s line | Possible reconstruction strategy |
|---|---|---|---|
| 1 | None | Intact | Uncemented hemispheric shell |
| 2A | Superior (less than 3 cm) | Intact | Uncemented hemispheric shell |
| 2B | Superolateral (less than 3 cm) | Intact | Uncemented hemispheric shell |
| 2C | Medial | Disrupted | Uncemented hemispheric shell with medial bone grafting |
| 3A | “Up and out” (more than 3 cm) | Intact | Uncemented hemispheric shell with porous metal augment(s) or structural allograft |
| 3B | “Up and in” (more than 3 cm) | Disrupted | Uncemented shell with porous metal augment or structural allograft ± acetabular distraction; cup-cage reconstruction; or custom triflange |