Presentation
Mechanical symptoms. ?meniscal tear
Patient Data
The free edge of the medial meniscus central third is truncated, and there is a horizontal longitudinal tear of the posterior third which exits the tibial side of the medial meniscus.
Note is made of an anomalous insertion of the medial meniscus, which inserts onto the ACL.
Evidence of full-thickness fissures and fraying of the median patella ridge articular cartilage with underlying subchondral change.
Case Discussion
Anomalous insertion of the medial meniscus (AIMM) is a congenital variation in the insertion of the anterior root of the medial meniscus, and as shown it can insert on to the anterior cruciate ligament (ACL). It can be mistaken for a meniscal tear, ACL tear or infrapatellar plica.