Question: In your opinion, when do you fix medial meniscal root tears? When do you leave them alone?
Medial and lateral menisci are crescent-shaped fibrocartilage structures that provide joint congruity, stabilization and lubrication and act as “shock absorbers” for joint preservation. During weight-bearing activities, the menisci dissipate axial loads and contain hoop stresses. The medial meniscus transmits approximately 50% of the total joint load of the knee medial compartment, thus protecting the articular cartilage from excessive force.
Tears to the medial meniscal root change the biomechanics and kinematics of the knee, which cause early degeneration of the joint. It has been shown the peak tibiofemoral contact pressure after a total meniscectomy is equal to a posterior medial meniscal root tear.
Recent kinematic/biomechanical studies have also shown the importance of the medial meniscus to anterior translation of the knee. Absence of the medial meniscus (entire medial meniscal root tear) places large stresses on the ACL, the primary ligament that prevents anterior translation of the knee.
Full Article: Medial meniscal root tears: Fix it or leave it alone