Background. Medial meniscus (MM) posterior root tear (PRT) is often caused by meniscal degeneration. whereas lateral meniscus (LM) PRT is mainly caused by trauma. especially trauma associated with anterior cruciate ligament (ACL) injuries. https://www.diegojavierfares.com/amazing-price-Kicker-48CDF104-Comp-10-Down-Firing-Loaded-Subwoofer-Enclosure-special-find/