The Orthobullets Podcast Foundations | Knee & Sports | Discoid Meniscus
Dec 26, 2025
Dive into a fascinating exploration of discoid meniscus, where the complexities of this knee structure are unraveled. Key diagnostic criteria from radiographic to MRI findings are discussed, including intriguing signs like the 'three-slice sign.' Listeners will learn about common radiographic features such as squaring and cupping. The podcast also tackles management strategies for asymptomatic cases and highlights a compelling pediatric vignette. This knowledge is crucial for frontline MSK providers diagnosing and managing knee issues.
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Discoid Meniscus Basics
- Discoid meniscus is a congenital hypertrophic meniscus most often affecting the lateral side and may be bilateral in 25% of cases.
- MRI diagnosis requires three or more contiguous 5 mm sagittal slices showing meniscal continuity.
Watch Asymptomatic Cases; Operate If Symptomatic
- Observe asymptomatic discoid menisci without tears and reserve surgery for symptomatic cases with pain or mechanical symptoms.
- Consider arthroscopic partial meniscectomy and saucerization for persistent symptoms or meniscal tears/detachment.
Radiographs Suggest, MRI Confirms
- Plain radiographs can suggest discoid meniscus by showing widened lateral joint space, squaring of the lateral femoral condyle, and cupping of the lateral tibial plateau.
- These signs prompt MRI confirmation rather than replacing it.