ArticleKnee surgery, sports traumatology, arthroscopy : official journal of the ESSKA2023
The meniscal extrusion index is a reliable indirect sign of different meniscal lesion patterns: a classification based on percentage of meniscal extrusion.
Article in Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers, 1 of them a synthesis that pooled it.
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10 citing papers in PubMed, 1 synthesis or guideline pooled it, 10 citations in OpenAlex.
- Centralization reduces meniscal extrusion, improves joint mechanics and functional outcomes in patients undergoing meniscus surgery: A systematic review and meta-analysis.Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA · 2025Pooled it
- Meniscal tissue engineering: Bridging clinical needs and experimental innovation.Journal of orthopaedic translation · 2026Review
- Combined Arthroscopic Medial Meniscal Root Repair and Centralization Using All-Suture Anchors Without a Posteromedial Portal.Arthroscopy techniques · 2026Article
- Standardized MRI nomenclature for knee meniscal lesions: SSR consensus panel report.Skeletal radiology · 2026Review
- Meniscal extrusion increases with age: Decade-specific magnetic resonance imaging reference values.Journal of experimental orthopaedics · 2026Article
- Lateral meniscus posterior root repair during ACL reconstruction restores knee stability and results in outcomes comparable to isolated ACL reconstruction: A propensity-matched cohort analysis.Journal of experimental orthopaedics · 2026Article
- Medial Meniscal Extrusion: A Narrative Review of Etiology, Diagnosis, and Therapeutic Strategies.Orthopedic research and reviews · 2026Review
- Arthroscopic Medial Meniscus Posterior Root Repair and Centralization With Medial Capsulodesis Using a Knotless Soft Anchor.Arthroscopy techniques · 2025Article
- Meniscal extrusion: Proposal for a novel qualitative classification.Journal of experimental orthopaedics · 2025Review
- Arthroscopic Repair of Extruded Meniscus Tears: Impact on Symptom Relief and Functional Improvement - A 2-Year Follow-Up Study.Medical science monitor : international medical journal of experimental and clinical research · 2024Article
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Authors and funding
7 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
purposeThis study's goal is to propose a straightforward classification system based on the MEI (Meniscal Extrusion Index), a measure of meniscal extrusion, that relates to various meniscal lesion patterns and has clinical and biomechanical significance. The study's secondary goal is to determine whether the standard 3 mm meniscal extrusion parameter still has value by correlating the MEI with it.
methods1350 knee MRIs that were performed over the course of 2 years made up the study cohort. Following the application of inclusion and exclusion criteria, 200 of those patients were qualified to participate in the study. All the measurements examined for this study underwent an interobserver reliability test.
resultsIn the 1350 MRIs that were examined for this study, meniscal extrusion of any grade was present 18.9% of the time. The use of the MEI revealed three groups of patients: those with a MEI < 20%, who are likely para-physiological; those with a MEY between 20% and 40%, who are in a grey area; and those with a MEY > 40%, who have lesions that are impairing the proper meniscal function. According to the authors' findings, the percentage of meniscal extrusion did not correlate with the finite number (3 mm), making the 3 mm parameter an unreliable evaluation method.
conclusionsThis study is clinically relevant, because it proposes a simple and reproducible classification of meniscal extrusion that may aid in evaluating the severity of an extrusion and help in the diagnosis of lesions that might be difficult to identify on MRI. LEVEL OF EVIDENCE: Level IV.
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