Elucidating the Discoid Meniscus with Proposed New Classification System

Discoid meniscus is an abnormal meniscal variant where the meniscus is thickened and abnormally shaped. Historically, discoid meniscus has been categorized using several proposed classification systems, but that described by Watanabe et al. remains most widely accepted. There are cases however, in which type I, type II, and type III (Wrisberg type) cannot be definitively assigned. This prospective study will aim to serve as a comprehensive classification system to eliminate uncertainty in diagnosis of discoid meniscal types. Additionally, we plan to correlate discoid type to chance of re-tear, re-operation, and/or overall outcome.