✅ Knee MRI Mastery/Chap 1. Meniscus

(Fig 1-E.20) Too-small meniscal allograft and failure

MSK MRI 2024. 2. 11. 10:10

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📌 Preoperative Imaging and Meniscal Sizing: 

  • Precise meniscal sizing is crucial for meniscal allograft transplantation (MAT) success. 
  • A mismatch in graft size should be less than 10% to maintain the meniscus's biomechanical integrity. 
  • ✅ Specifically, too small allografts (beyond a 5-mm margin of error) can jeopardize long-term functionality and mechanical durability due to excessive biomechanical load. 
  • ✅ Conversely, oversized allografts may also compromise biomechanical function and potentially damage the articular cartilage.

 

📌 Graft Failure in MAT: 

  • Graft failure can manifest as displacement of the allograft meniscus body, resembling a "bucket-handle" tear on MRI scans. 
  • ✅ Factors contributing to failure include improper healing of the allograft menisci and inadequate revascularization, which may lead to graft shrinkage.

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