Table 3.
Osteochondral Allograft Magnetic Resonance Imaging Scoring System (OCAMRISS) Scheme.
| MRI Feature | MRI Score | |
|---|---|---|
| Cartilage features | 1. Cartilage signal of graft | 0: Normal |
| 1: Altered intensity (either hypointense or hyperintense, but not fluid) | ||
| 2: Fluid signal intensity on all sequences | ||
| 2. Cartilage “fill” of graft (percentage of volume) | 0: 76% to 100% | |
| 1: 51% to 75% or >100% | ||
| 2: <50% | ||
| 3. Cartilage edge integration at host- graft junction | 0: No discernible boundary | |
| 1: Discernible boundary | ||
| 2: Discernible fissure >1 mm | ||
| 4. Cartilage surface congruity of graft and host-graft junction | 0: Flush | |
| 1: <50% offset of host cartilage | ||
| 2: >50% offset of host cartilage | ||
| 5. Calcified cartilage integrity of graft | 0: Intact, thin, and smooth | |
| 1: Altered (disrupted, thickened, or blurred) | ||
| Bone features | 6. Subchondral bone plate congruity of graft and host-graft junction | 0: Intact and flush |
| 1: Disrupted or not flush by >1 subchondral thickness | ||
| 7. Subchondral bone marrow signal intensity of graft relative to epiphyseal bone | 0: Normal | |
| 1: Abnormal (bone marrow edema pattern or hypointensity on all sequences) | ||
| 8. Osseous integration at host-graft junction | 0: Crossing trabeculae | |
| 1: Discernible cleft | ||
| 9. Presence of cystic changes of graft and host-graft junction | 0: Absent | |
| 1: Present | ||
| Ancillary features | 10. Opposing cartilage | 0: Normal |
| 1: Abnormal | ||
| 11. Meniscal tears | 0: Absent | |
| 1: Present | ||
| 12. Synovitis | 0: Absent | |
| 1: Present | ||
| 13. Fat pad scarring | 0: Absent | |
| 1: Present |