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Table 4 Comparison of modified Anderson’s MRI-based classification score between preoperative state and 12-month visit outcome

From: In vivo animal study and clinical outcomes of autologous atelocollagen-induced chondrogenesis for osteochondral lesion treatment

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
  1. MRI magnetic resonance imaging