✅ Knee MRI Mastery/Chap 5AB. Chondral and osteochondral

(Fig 5-A.08) International Cartilage Repair Society grade 3 and 4

MSK MRI 2024. 7. 4. 18:25

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📌 ICRS Cartilage Defect Classification

 

✅ ICRS Grade 3

  • Cartilage defects extending to more than 50% of cartilage depth but not through the subchondral bone.
  • Includes chondral blisters, delamination, and chondral flaps without associated subchondral marrow signal.

 

★ Subcategories:

  • ICRS Grade 3A: Defect more than 50% but not down to the calcified layer.
  • ICRS Grade 3B: Defect more than 50% down to the calcified layer.
  • ICRS Grade 3C: Defect down to but not through the subchondral bone plate.
  • ICRS Grade 3D: Defect more than 50% with blisters.

 

✅ ICRS Grade 4

  • Full-thickness chondral lesions extending to the subchondral bone plate with subchondral marrow edema-like signal or cystic changes.
  • When the cartilage lesion itself does not clearly extend to the subchondral bone, full-thickness extent is suggested by subchondral cysts or bone marrow edema.

 

★ Subcategories:

  • ICRS Grade 4A: Defect includes superficial subchondral bone plate.
  • ICRS Grade 4B: Defect down to deep subchondral bone.

 

References

  • J Clin Orthop Trauma. 2021 Sep 25;22:101610
  • Magn Reson Imaging Clin N Am 19 (2011) 379–405

 

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#ICRS #CartilageDefects #Orthopedics #Radiology #Musculoskeletal #ChondralLesions #SubchondralBone #MRI