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Revised IOR Classification: disease severity
| Criteria | Class | Subclass | |
|---|---|---|---|
| No deformities—no functional limitations | I | IA | ≤5 sites with OC |
| IB | >5 sites with OC | ||
| Deformities—no functional limitations | II | IIA | ≤2 sites with deformities |
| IIB | >2 sites with deformities | ||
| Deformities—functional limitations | III | IIIA | 1 site with functional limitation |
| IIIB | >1 site with functional limitation | ||
Abbreviations: IOR, Istituto Ortopedico Rizzoli; OC, osteochondroma(s).
