Ipsilateral Medial and Lateral Discoid Meniscus with Medial Meniscus Tear

Abstract

Introduction:Discoid meniscus is a well-documented knee pathology, and there are many cases of medial or lateral discoid meniscus reported in the literature. However, ipsilateral concurrent medial and lateral discoid meniscus is very rare, and only a few cases have been reported. Herein, we report a case of concurrent medial and lateral discoid meniscus.Case Report:A 27-year-old Japanese man complained of pain on medial joint space in his right knee that was diagnosed as a complete medial and lateral discoid meniscus. In magnetic resonance imaging, although the lateral discoid meniscus had no tear, the medial discoid meniscus had a horizontal tear. Arthroscopic examination of his right knee similarly revealed that the medial discoid meniscus had a horizontal tear. In addition, the discoid medial meniscus also had an anomalous insertion to the anterior cruciate ligament, and there was also mild fibrillation of the medial tibial cartilage surface. We performed arthroscopic partial meniscectomy for the torn medial discoid meniscus but not for the asymptomatic lateral discoid meniscus. The latest follow-up at 18 months indicated satisfactory results.Conclusion:We report a rare case of ipsilateral medial and lateral discoid meniscus with medial meniscus tear. The medial discoid meniscus with tear was treated with partial meniscectomy, whereas the lateral discoid meniscus without tear was only followed up.

Surgical Management of Medial Discoid Meniscus in Pediatric and Adolescent Patients

“…Concurrent meniscal tears identified intraoperatively have been frequently reported in prior reports of MDM. 13,15,18,[23][24][25][26] Consistent with the literature, 75% of our cases demonstrated meniscal tears; one-third of tears were of the horizontal cleavage variety-the most common meniscal tear reported in the MDM literature. 13,15,18,[23][24][25][26] Other reports have observed additional knee abnormalities, including complete coalescence of the MDM and anterior cruciate ligament, 23 concurrent LDM, 26 and cysts anterolateral 27 or posterior 28 to the meniscus.…”

“…13,15,18,[23][24][25][26] Consistent with the literature, 75% of our cases demonstrated meniscal tears; one-third of tears were of the horizontal cleavage variety-the most common meniscal tear reported in the MDM literature. 13,15,18,[23][24][25][26] Other reports have observed additional knee abnormalities, including complete coalescence of the MDM and anterior cruciate ligament, 23 concurrent LDM, 26 and cysts anterolateral 27 or posterior 28 to the meniscus. In their investigation of LDM, Klingele et al 29 determined that peripheral rim instability was significantly more common in younger patients with complete LDM.…”

“…Concurrent meniscal tears identified intraoperatively have been frequently reported in prior reports of MDM 13,15,18,23–26. Consistent with the literature, 75% of our cases demonstrated meniscal tears; one-third of tears were of the horizontal cleavage variety—the most common meniscal tear reported in the MDM literature 13,15,18,23–26.…”

Menisco lateral discoide: revisión de la literatura

“…8,9 La incidencia del menisco discoide lateral bilateral es de hasta 25% en la población asiática, y el menisco discoide medial bilateral es poco frecuente. [10][11][12][13][14] La coexistencia de un menisco discoide medial y lateral en la misma rodilla es más raro, 15,16 mientras que la coexistencia en ambas rodillas sólo se ha reportado una vez. 17…”

Ipsilateral Medial and Lateral Discoid Menisci: A Rare Combination of Infrequent Anatomic Variants

“…To the best of our knowledge, only six cases have been reported in the literature to date. [1] e meniscus, due to their semilunar shape, adds stability to the knee as well as is thought to reduce stress and friction from motion. A discoid meniscus is an anatomic variant which reduces the stability of the knee and has higher rates of tearing and degenerating.…”