Protruding anterior medial meniscus—An indirect sign of posterior cruciate ligament deficiency

Highlights: • Chronic PCL ruptures are often missed on routine MRI. • Chronic PCL deficiency leads to subluxation of the tibia in the medial compartment. • Posterior translation of the tibia compared to the femur is only partly helpful as indirect sign. • Anterior protrusion of the medial meniscus beyond 3 mm can indicate PCL deficiency. - Abstract: Backgroundto examine if PROTruding of the Anterior Medial Meniscus (PROTAMM) could be an indirect sign of PCL deficiency by comparing PROTAMM to passive posterior tibial sagging (PSS) for chronic PCL rupture on routine MRI.