Meniscus - Discoid
synonyms: "Popping knee syndrome," discoid meniscus
Discoid Meniscus ICD-9
- 717.5 (derangement of meniscus, not elsewhere classified)
Discoid Meniscus Etiology / Epidemiology / Natural History
Discoid Meniscus Anatomy
Discoid Meniscus Clinical Evaluation
- C/O knee pain with mechnical symptoms.
- Meniscal symptoms in a child <10y/o.
- Classic complaint is popping with the knee in extension.
Discoid Meniscus Xray / Diagnositc Tests
- Lateral and weight bearing A/P knee films, may show joint space widening, squaring of the lateral condlye, cupping of the lateral tibia plateau or a hypoplastic lateral intercondylar spine.
- MRI: generally clearly shows abnormal meniscal morphology.
Discoid Meniscus Classification / Treatment
- Incomplete (Type II):
- Complete (Type I):
- Wrisberg's variant Type III): discoid meniscus is only attached to the medial femoral condyle via the meniscofemoral (Wrisberg) ligament. Can displace into the notch with knee extension.
- Incidental discoid meniscus found during knee arthroscopy do not require treatment
- Tears in discoid menisci are treated with excision of the torn portion and saucerization. Repair is indicated for peripheral detachments.
Discoid Meniscus Associated Injuries / Differential Diagnosis
Discoid Meniscus Complications
Discoid Meniscus Follow-up Care
- 71% excellent, 24% good, 5% fair for arthroscopic lateral menisectomy in patients with symptomatic discoid lateral meniscus. (Aglietti P, Am J Knee Surg 1999;12:83).
Discoid Meniscus Review References
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