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Mayo classification of the rheumatoid elbow
| I | Osteopenia, subchondral cysts, and synovitis without marked joint line space narrowing |
| II | Joint line space narrowing with preservation of the overall bony architecture |
| III | Moderate bone loss affecting 1 (IIIA) or both (IIIB) humeral columns |
| IV | Complete disintegration of the elbow joint with dysfunctional instability (mutilans rheumatoid arthritis) |
| V | Ankylosis secondary to juvenile rheumatoid arthritis |
