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Classification of AIIS types
| Type | Description | CT definition | Suggested clinical applications |
|---|---|---|---|
| I | Up-sloping | Up-sloping on ischium view | AIIS does not contribute to impingement |
| II | Down-sloping | Down-sloping on ischium view but does not cross caudad to rim in any of the views | AIIS may contribute to impingement |
| III | Hooked | Down-sloping on ischium view and crosses caudad to rim in any of the views | AIIS may contribute to impingement |
AIIS = anterior inferior iliac spine.
