Original articleCongenital discoid meniscus: A cause of internal derangement of the knee

Congenital discoid meniscus is not an uncommon cause of internal derangement of the knee. It occurs much more frequently in the external than in the internal compartment of the joint. It usually causes symptoms in childhood or adolescence, and an injury may or may not precipitate the difficulty. The symptoms and signs are those of internal derangement, and the treatment should be operative removal of the anomalous cartilage. The discoid member may or may not show signs of damage. The operative results are uniformly good.