Table 4 Comparison of modified Anderson’s MRI-based classification score between preoperative state and 12-month visit outcome
Stage | Characteristics | Initial MRI | Follow-up MRI (12-month visit) |
|---|---|---|---|
Stage 0 | Normal | 0 (0 %) | 1 (9.1 %) |
Stage I | Marrow oedema | 2 (18.2 %) | 4 (36.4 %) |
Stage IIA | Irregular subchondral bone plate | 0 (0 %) | 3 (27.3 %) |
Stage IIB | Formation of subchondral cyst | 3 (27.3 %) | 2 (18.2 %) |
Stage IIC | Incomplete separation of fragment | 0 (0 %) | 1 (9.1 %) |
Stage III | Unattached, undisplaced fragment with synovial fluid around fragment | 4 (36.4 %) | 0 (0 %) |
Stage IV | Displaced fragment | 2 (18.2 %) | 0 (0 %) |
Total number | 11 | 11 |