Discoid meniscus: Treatment considerations and updates

Figure 1 Watanabe classification of the discoid lateral meniscus. A: A complete discoid lateral meniscus (DLM) (type I) is a meniscus that covers the entire lateral tibial plateau and has a normal posterior attachment; B: Incomplete DLM (type II) refers to a meniscus that covers most of the lateral tibial plateau with normal posterior attachment as well; C: Wrisberg DLM (type III) (has normal discoid morphology but lacks posterior attachment (popliteomeniscal fascicles) and only has the Wrisberg ligament attached.