The anterior horn of the medial meniscus attaches by a broad root to the anterior intercondylar area of the tibia, anterior to the ACL attachment. The transverse (intermeniscal) ligament often links it to the anterior horn of the lateral meniscus.
| Origin | Anterior horn of the medial meniscus |
|---|---|
| Insertion | Anterior intercondylar area of the tibia, anterior to the ACL attachment |
Anchors the medial meniscal anterior horn, constrains anterior meniscal movement during loading, and fixes the horn so the meniscus can generate hoop stresses and spread compressive load.
Anterior medial horn tears are uncommon, occurring in hyperextension and valgus injuries. A tear of the anterior root disrupts hoop stress function, allowing the meniscus to extrude medially (more than 3 mm on MRI) and raising medial compartment contact pressure; transtibial pullout repair can restore the attachment. Anterior root tears are less common than posterior root tears but carry similar biomechanical significance. RAMP lesions (posterior peripheral detachment) are a distinct and more common concurrent ACL injury pattern.
Anterior horn medial meniscal injury from hyperextension, repaired when exceeding one-third meniscal width.
Detachment of the anterior root causing meniscal extrusion and loss of hoop stress function, treated with transtibial pullout repair.
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