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Discoid Meniscus
Christopher G. Anton, MD
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KEY FACTS

  • Imaging

    • Pathology

      • Clinical Issues

        TERMINOLOGY

        • Definitions

          • Large, congenitally dysplastic meniscus with loss of normal semilunar shape

        IMAGING

        • General Features

          • Radiographic Findings

            • MR Findings

              • Ultrasonographic Findings

                • Imaging Recommendations

                  DIFFERENTIAL DIAGNOSIS

                    PATHOLOGY

                    • General Features

                      • Staging, Grading, & Classification

                        • Gross Pathologic & Surgical Features

                          CLINICAL ISSUES

                          • Presentation

                            • Demographics

                              • Natural History & Prognosis

                                • Treatment

                                  DIAGNOSTIC CHECKLIST

                                  • Consider

                                    • Image Interpretation Pearls

                                      Selected References

                                      1. Nishino K et al: Magnetic resonance imaging T2 relaxation times of articular cartilage before and after arthroscopic surgery for discoid lateral meniscus. Arthroscopy. 37(2):647-54, 2021
                                      2. Tyler PA et al: Update on imaging of the discoid meniscus. Skeletal Radiol. ePub, 2021
                                      3. Yang SJ et al: A reliable, ultrasound-based method for the diagnosis of discoid lateral meniscus. Arthroscopy. 37(3):882-90, 2021
                                      4. Ha CW et al: Predictive validity of radiographic signs of complete discoid lateral meniscus in children using machine learning techniques. J Orthop Res. 38(6):1279-88, 2019
                                      5. Restrepo R et al: Discoid meniscus in the pediatric population: emphasis on MR imaging signs of instability. Magn Reson Imaging Clin N Am. 27(2):323-39, 2019
                                      6. Park YB et al: Prediction models to improve the diagnostic value of plain radiographs in children with complete discoid lateral meniscus. Arthroscopy. 34(2):479-489.e3, 2018
                                      7. Ha CW et al: The utility of the radiographic condylar cut-off sign in children and adolescents with complete discoid lateral meniscus. Knee Surg Sports Traumatol Arthrosc. 25(12):3862-8, 2017
                                      8. Choi SH et al: Do the radiographic findings of symptomatic discoid lateral meniscus in children differ from normal control subjects? Knee Surg Sports Traumatol Arthrosc. 23(4):1128-34, 2015
                                      9. Kushare I et al: Discoid meniscus: diagnosis and management. Orthop Clin North Am. 46(4):533-40, 2015
                                      10. Song JG et al: Radiographic evaluation of complete and incomplete discoid lateral meniscus. Knee. 22(3):163-8, 2015
                                      11. Stein MI et al: Regeneration of a discoid meniscus after arthroscopic saucerization. Am J Orthop (Belle Mead NJ). 42(1):E5-8, 2013
                                      12. Yoo WJ et al: Meniscal morphologic changes on magnetic resonance imaging are associated with symptomatic discoid lateral meniscal tear in children. Arthroscopy. 28(3):330-6, 2012
                                      13. Ozcanli H et al: Relation of discoid lateral meniscus and cord-like anterior intermeniscal ligament: morphological and clinical study. Surg Radiol Anat. 33(8):673-8, 2011
                                      14. Wasser L et al: Arthroscopic treatment of discoid meniscus in children: Clinical and MRI results. Orthop Traumatol Surg Res. 97(3):297-303, 2011
                                      15. Ha CW et al: The condylar cutoff sign: quantifying lateral femoral condylar hypoplasia in a complete discoid meniscus. Clin Orthop Relat Res. 467(5):1365-9, 2009
                                      16. Kramer DE et al: Meniscal tears and discoid meniscus in children: diagnosis and treatment. J Am Acad Orthop Surg. 17(11):698-707, 2009
                                      17. Ahn JH et al: Arthroscopic partial meniscectomy with repair of the peripheral tear for symptomatic discoid lateral meniscus in children: results of minimum 2 years of follow-up. Arthroscopy. 24(8):888-98, 2008
                                      18. Yaniv M et al: The discoid meniscus. J Child Orthop. 1(2):89-96, 2007
                                      19. Singh K et al: MRI appearance of Wrisberg variant of discoid lateral meniscus. AJR Am J Roentgenol. 187(2):384-7, 2006
                                      20. Klingele KE et al: Discoid lateral meniscus: prevalence of peripheral rim instability. J Pediatr Orthop. 24(1):79-82, 2004
                                      21. Youm T et al: Discoid lateral meniscus: evaluation and treatment. Am J Orthop. 33(5):234-8, 2004
                                      22. Samoto N et al: Diagnosis of discoid lateral meniscus of the knee on MR imaging. Magn Reson Imaging. 20(1):59-64, 2002
                                      23. Ahn JH et al: Discoid lateral meniscus in children: clinical manifestations and morphology. J Pediatr Orthop. 21(6):812-6, 2001
                                      24. Rohren EM et al: Discoid lateral meniscus and the frequency of meniscal tears. Skeletal Radiol. 30(6):316-20, 2001
                                      25. Connolly B et al: Discoid meniscus in children: magnetic resonance imaging characteristics. Can Assoc Radiol J. 47(5):347-54, 1996
                                      26. Auge WK 2nd et al: Bilateral discoid medial menisci with extensive intrasubstance cleavage tears: MRI and arthroscopic correlation. Arthroscopy. 10(3):313-8, 1994
                                      27. Silverman JM et al: Discoid menisci of the knee: MR imaging appearance. Radiology. 173(2):351-4, 1989
                                      Related Anatomy
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                                      Related Differential Diagnoses
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                                      References
                                      Tables

                                      Tables

                                      KEY FACTS

                                      • Imaging

                                        • Pathology

                                          • Clinical Issues

                                            TERMINOLOGY

                                            • Definitions

                                              • Large, congenitally dysplastic meniscus with loss of normal semilunar shape

                                            IMAGING

                                            • General Features

                                              • Radiographic Findings

                                                • MR Findings

                                                  • Ultrasonographic Findings

                                                    • Imaging Recommendations

                                                      DIFFERENTIAL DIAGNOSIS

                                                        PATHOLOGY

                                                        • General Features

                                                          • Staging, Grading, & Classification

                                                            • Gross Pathologic & Surgical Features

                                                              CLINICAL ISSUES

                                                              • Presentation

                                                                • Demographics

                                                                  • Natural History & Prognosis

                                                                    • Treatment

                                                                      DIAGNOSTIC CHECKLIST

                                                                      • Consider

                                                                        • Image Interpretation Pearls

                                                                          Selected References

                                                                          1. Nishino K et al: Magnetic resonance imaging T2 relaxation times of articular cartilage before and after arthroscopic surgery for discoid lateral meniscus. Arthroscopy. 37(2):647-54, 2021
                                                                          2. Tyler PA et al: Update on imaging of the discoid meniscus. Skeletal Radiol. ePub, 2021
                                                                          3. Yang SJ et al: A reliable, ultrasound-based method for the diagnosis of discoid lateral meniscus. Arthroscopy. 37(3):882-90, 2021
                                                                          4. Ha CW et al: Predictive validity of radiographic signs of complete discoid lateral meniscus in children using machine learning techniques. J Orthop Res. 38(6):1279-88, 2019
                                                                          5. Restrepo R et al: Discoid meniscus in the pediatric population: emphasis on MR imaging signs of instability. Magn Reson Imaging Clin N Am. 27(2):323-39, 2019
                                                                          6. Park YB et al: Prediction models to improve the diagnostic value of plain radiographs in children with complete discoid lateral meniscus. Arthroscopy. 34(2):479-489.e3, 2018
                                                                          7. Ha CW et al: The utility of the radiographic condylar cut-off sign in children and adolescents with complete discoid lateral meniscus. Knee Surg Sports Traumatol Arthrosc. 25(12):3862-8, 2017
                                                                          8. Choi SH et al: Do the radiographic findings of symptomatic discoid lateral meniscus in children differ from normal control subjects? Knee Surg Sports Traumatol Arthrosc. 23(4):1128-34, 2015
                                                                          9. Kushare I et al: Discoid meniscus: diagnosis and management. Orthop Clin North Am. 46(4):533-40, 2015
                                                                          10. Song JG et al: Radiographic evaluation of complete and incomplete discoid lateral meniscus. Knee. 22(3):163-8, 2015
                                                                          11. Stein MI et al: Regeneration of a discoid meniscus after arthroscopic saucerization. Am J Orthop (Belle Mead NJ). 42(1):E5-8, 2013
                                                                          12. Yoo WJ et al: Meniscal morphologic changes on magnetic resonance imaging are associated with symptomatic discoid lateral meniscal tear in children. Arthroscopy. 28(3):330-6, 2012
                                                                          13. Ozcanli H et al: Relation of discoid lateral meniscus and cord-like anterior intermeniscal ligament: morphological and clinical study. Surg Radiol Anat. 33(8):673-8, 2011
                                                                          14. Wasser L et al: Arthroscopic treatment of discoid meniscus in children: Clinical and MRI results. Orthop Traumatol Surg Res. 97(3):297-303, 2011
                                                                          15. Ha CW et al: The condylar cutoff sign: quantifying lateral femoral condylar hypoplasia in a complete discoid meniscus. Clin Orthop Relat Res. 467(5):1365-9, 2009
                                                                          16. Kramer DE et al: Meniscal tears and discoid meniscus in children: diagnosis and treatment. J Am Acad Orthop Surg. 17(11):698-707, 2009
                                                                          17. Ahn JH et al: Arthroscopic partial meniscectomy with repair of the peripheral tear for symptomatic discoid lateral meniscus in children: results of minimum 2 years of follow-up. Arthroscopy. 24(8):888-98, 2008
                                                                          18. Yaniv M et al: The discoid meniscus. J Child Orthop. 1(2):89-96, 2007
                                                                          19. Singh K et al: MRI appearance of Wrisberg variant of discoid lateral meniscus. AJR Am J Roentgenol. 187(2):384-7, 2006
                                                                          20. Klingele KE et al: Discoid lateral meniscus: prevalence of peripheral rim instability. J Pediatr Orthop. 24(1):79-82, 2004
                                                                          21. Youm T et al: Discoid lateral meniscus: evaluation and treatment. Am J Orthop. 33(5):234-8, 2004
                                                                          22. Samoto N et al: Diagnosis of discoid lateral meniscus of the knee on MR imaging. Magn Reson Imaging. 20(1):59-64, 2002
                                                                          23. Ahn JH et al: Discoid lateral meniscus in children: clinical manifestations and morphology. J Pediatr Orthop. 21(6):812-6, 2001
                                                                          24. Rohren EM et al: Discoid lateral meniscus and the frequency of meniscal tears. Skeletal Radiol. 30(6):316-20, 2001
                                                                          25. Connolly B et al: Discoid meniscus in children: magnetic resonance imaging characteristics. Can Assoc Radiol J. 47(5):347-54, 1996
                                                                          26. Auge WK 2nd et al: Bilateral discoid medial menisci with extensive intrasubstance cleavage tears: MRI and arthroscopic correlation. Arthroscopy. 10(3):313-8, 1994
                                                                          27. Silverman JM et al: Discoid menisci of the knee: MR imaging appearance. Radiology. 173(2):351-4, 1989