Original article
Congenital discoid meniscus: A cause of internal derangement of the knee

https://doi.org/10.1016/S0002-9610(41)90383-5Get rights and content

Abstract

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.

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    The osteochondral injury to the femoral medial condyle was caused by damaged meniscal margins, and this injury damaged the tibial cartilage. Discoid medial meniscus, a rare congenital anomaly, was first reported by Cave and Staples,4 and fewer than 70 cases have been reported in the literature.5-7 Various clinical symptoms of discoid meniscus have been reported: Discoid lateral meniscus tends to manifest as hypermobility during childhood without tearing, whereas discoid medial meniscus is asymptomatic in childhood until shown by a tear.8,9

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    It may also be due to a vertical tear, inducing instability. Plain X-ray may show an enlarged medial femorotibial joint line [3,7,11,25,42], but is more often, as in the present cases, normal. MRI is the best means of confirming diagnosis and exploring for associated meniscal lesions [5,15,25,40].

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1

from the Orthopedic Service, Massachusetts General Hospital.

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