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Radiographic criteria for loosening of an acetabular reinforcement ring according to Siebenrock et al. [20]
| Grade of loosening | Criteria |
|---|---|
| Definitely loose | New breakage of screws used to fix the acetabular reinforcement device |
| Evidence of acetabular migration | |
| Complete, progressive radiolucent line present medially and superiorly or around the screws | |
| Probably loose | Progressive radiolucencies present medially or superiorly |
