Discoid Meniscus Wheeless

Description: - a thickened and wafer shaped lateral meniscus varient;
- discoid meniscus may range from complete disc to a ring shaped meniscus;
- occurs in upto 5% of population (but only a % of these are symptomatic) (prevalence may be higher in orientals (15%));
- usually involves lateral meniscus and is frequently bilateral (20% of pts);
- although a congenital etiology for discoid menisci has been proposed, the discoid variant is not normally found in the fetus;
- clinically patients may complain of pain, swelling, and snapping;
- the classic discoid snapping knee is usually caused by a discoid meniscus w/ a deficient menisco-tibial ligament;
Wheeless' Textbook of Orthopaedics