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Case Reports
. 2019 Apr;98(15):e15182.
doi: 10.1097/MD.0000000000015182.

Bilateral discoid medial Meniscus: Two case reports

Xiaolong Yang  1 , Decheng Shao
Affiliations
Case Reports

Bilateral discoid medial Meniscus: Two case reports

Xiaolong Yang et al. Medicine (Baltimore). 2019 Apr.

Abstract

Rationale: Discoid meniscus is an anatomical congenital anomaly more often found in the lateral meniscus. A discoid medial meniscus is a very rare anomaly, and it is difficult to diagnose a bilateral discoid medial meniscus because not all the discoid medial menisci are symptomatic. Herein, we report 2 cases of bilateral discoid medial meniscus.

Patients concerns: Case1: a 23-year-old man presented with complaints of pain and occasional clicking of the right knee for 6 years, the left knee was asymptomatic. Case 2: a 51-year-old woman had a 1-month history of pain and a feeling of "giving away" in both knees.

Diagnoses: Based on physical examination and magnetic resonance imaging (MRI) findings, they were diagnosed with bilateral discoid medial meniscal tears.

Interventions: Case 1: partial meniscectomy and reshaping were performed for the torn discoid medial meniscus of the right knee only. Case 2: partial medial meniscectomy and reshaping were performed for the torn discoid medial meniscus on both knees.

Outcomes: The postoperative pain and the recovery of joint function were observed. The average follow-up time of 2 patients was 1 year. The Lysholm score of 2 patients was improved from 55 to 95 and 40 to 90 respectively. The pain of knee joint was relieved and the symptoms of disharmony were obviously improved.

Lessons: We recommend preservation of the discoid medial meniscus in asymptomatic patients. Meniscectomy and reshaping for injured discoid medial meniscus produces promising short-term results.

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Conflict of interest statement

The authors report no conflicts of interest.

Figures

Figure 1
Figure 1
A and B: Coronal view of MRI showing complete-type medial discoid meniscus in both knees and a tear in the right knee; C and D: In arthroscopic view, a complete medial discoid meniscus with a partial complex tear in red zone of the body and posterior horn was found, which was performed meniscoplasty later. MRI = magnetic resonance imaging.
Figure 2
Figure 2
A and B: Coronal MR images of the both knees show a complete discoid medial meniscus with tear; C and D: Arthroscopic images show discoid medial meniscus with a complex tear in left knee and a longitudinal tear in right knee.
See this image and copyright information in PMC

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