 | |||
| Type 1a | Type 1b | Type 2a | Type 2b |
| Anterior structure intact | Anterior structure intact | Compromised | Incompetent |
| Minimal upwards migration | Minimal upwards migration | Upwards | Forwards and upwards |
| Femoralization | Femoralization | Minimal | None |
| Mechanical stabilization | Abnormal | Insufficient | None |
| Acetabularization | Glenoid erosion | Glenoid and humeral erosion | None |
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