https://youtu.be/kEuMzUrHD0M"Anomalous insertion of the medial meniscus (AIMM) into the anterior cruciate ligament (ACL) is an uncommon condition, seen in about 0.52% of arthroscopy cases. It involves a ligament extending to the ACL from the anterior horn of the medial meniscus, near the root.
This variant accessory insertion appears on sagittal proton density–weighted MRI images as a fibrous strand connecting the anterior horn to the ACL. It's important to distinguish this anomaly from an ACL tear, a meniscal tear, or an infrapatellar plica in MRI interpretations.
The anterior meniscofemoral ligament, found in this condition, runs parallel and posterior to the ligamentum mucosum and attaches anteriorly to the ACL. It looks similar to the infrapatellar plica but is more medially located and doesn't extend into the infrapatellar fat pad.
The infrapatellar plica, or ligamentum mucosum, starts at the anterior intercondylar notch and runs anteroinferiorly, curving up to the lower pole of the patella. When both the anterior meniscofemoral ligament of the medial meniscus and the infrapatellar plica are present, the former lies parallel to and posterior to the ligamentum mucosum."
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