✅ High-grade partial meniscectomy (>25%)
- In cases of high-grade partial meniscectomy, where more than 25% of the meniscus is removed, diagnosing tears becomes less accurate.
- For T2-weighted MRI scans, a high signal intensity specifically indicates synovial fluid within a tear's cleft with over 90% specificity, but this sign lacks sensitivity (about 60%–80%).
📌 Criteria for identifying a recurrent tear after more than 25% of the meniscus has been resected include:
- A definite surfacing T2 fluid signal (or a high T1 signal that is isointense to intra-articular gadolinium in MR arthrography) visible on two or more images or the presence of a displaced meniscal fragment.
- A definitive surfacing fluid signal on just one image suggests a possible tear.
"Visualizing MSK Radiology: A Practical Guide to Radiology Mastery"
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