Discoid meniscus is a rare anatomical variant with altered morphology and structure that can sometimes present symptomatically, typically in the pediatric population. The discoid meniscus is usually in the lateral compartment of the knee and is characterized by a partial or complete filling-in of central meniscal tissue, increased meniscal thickness, disorganization of longitudinal collagen fibers, and sometimes lack of peripheral attachments. These changes to both the macro- and micro-structure of the meniscus predispose affected patients to increased rates of both meniscal tears and mechanical symptoms. Surgical management of symptomatic discoid meniscus is directed toward symptom resolution while preserving sufficient functional meniscal tissue to delay or prevent the development of osteoarthritis. Modern surgical techniques consist of arthroscopic saucerization of the discoid meniscus with repair of associated meniscal tears and stabilization of peripheral attachments. Although long-term outcome data are lacking, short- and mid-term outcomes for patients treated with arthroscopic partial meniscectomy and meniscal repair and/or stabilization as needed are generally good.
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