Diagnostic criterion to distinguish between incomplete and complete discoid lateral meniscus on MRI

The majority of abnormal findings or lesions on T2-weighted fast spin-echo (FSE) magnetic resonance imaging (MRI) are hyperintense due to increased perfusion or fluid content, such as infections, tumours or synovitis. Hypointense lesions on T2-weighted images (both fat-suppressed and non-fat-suppressed) are less common and can sometimes be overlooked. Such lesions have limited differential diagnostic possibilities, and include vacuum phenomenon, loose body, tenosynovial giant cell tumour, rheumatoid arthritis, haemochromatosis, gout, amyloid, chondrocalcinosis, hydroxyapetite deposition disease, lipoma arborescens, arthrofibrosis and iatrogenic lesions. These lesions often show characteristic appearances and predilections in the knee. In this article, the authors describe the MRI features of hypointense T2 lesions on routine knee MRI and outline a systematic diagnostic approach towards their evaluation. Key Points • Hypointense lesions on T2 images (T2 Dark Lesions) encompass limited diagnostic possibilities. • T2 Dark lesions often show characteristic appearances and predilections in the knee. • A systematic diagnostic approach will help radiologists make the correct diagnosis.

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“…Discoid menisci are most commonly observed on the lateral side and are more prone to wear and tear (Fig. 6) [19,20].…”

Section: Meniscal Lesions and Variantsmentioning

confidence: 99%

T2 black lesions on routine knee MRI: differential considerations

et al. 2015

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“…A torn DLM also increases the contact pressure on the articular surface, which gives rise to knee osteoarthritis [7,8]. DLM is classified as complete DLM (CDLM) and incomplete DLM (ICDLM), where a CDLM is thicker than an ICDLM and thus more prone to tears and exacerbation of tears [9,10]. Lateral meniscus tears become more difficult to treat as they increase in size, so DLM must be diagnosed early before this occurs [11].…”

Section: Introductionmentioning

confidence: 99%

“…Various methods can be used to diagnose DLM, including plain radiography, ultrasonography, and magnetic resonance imaging (MRI) [9,12]. MRI displays the shape of the lateral meniscus clearly, but it is expensive and not available at all hospitals.…”

Section: Introductionmentioning

confidence: 99%

Tibial eminence width can predict the presence of complete discoid lateral meniscus: A preliminary study

Hino

Furumatsu

Fujii

et al. 2017

Journal of Orthopaedic Science

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“…The complete DLM has larger width than incomplete DLM. Choi et al [6] reported that the average width of complete and incomplete DLM observed by MRI was 23.3 mm and 19.3 mm, respectively. Yet, there were few studies compared the thickness between complete and incomplete DLM.…”

Section: Discussionmentioning

confidence: 98%

Effect of discoid lateral meniscus on tibiofemoral joint cartilage damage in middle-aged patients

Sulaiman

et al. 2021

Preprint

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Purpose: To investigate the effect of discoid lateral meniscus (DLM) on cartilage damage of the medial and lateral compartments of the knee in middle-aged patients.Methods: We analyzed data from 44 patients (54 knees) with symptomatic discoid lateral meniscus (DLM group) and 30 patients (30 knees) with a non-discoid lateral meniscus tear (control group). All patients were over 40 years old. We compared the tibiofemoral angle (TFA) and cartilage injury rate between the two groups. We further classified DLM group patients based on dysmorphic features of the menisci (DLM type), presence/absence of meniscal tear, and symptom durations, then analyzed whether these parameters could affect the number of cartilage injuries in the knee medial and lateral compartments.Results: DLM group showed higher TFA values (2.18°±2.86°) than control group (0.84°±1.35°, P=0.002), and a higher occurrence of medial compartment cartilage damage (P=0.003). Within the DLM group, patients with cartilage damage showed higher BMI than those without cartilage damage (P=0.009 for medial compartment and P=0.001 for lateral, respectively). We found that having symptoms for more than 6 months was associated with cartilage damage in the lateral compartment (P=0.021), but not the medial compartment (P=0.858). Neither presence/absence of a meniscal tear, nor DLM type affected cartilage injury rate in either the medial or lateral compartment (P>0.05).Conclusion: Varus inclination caused by DLM could lead to cartilage injury in the medial compartment in middle-aged patients, but may not reduce the occurrence of chondral damage in the lateral compartment. Rather, lateral compartment chondral damage in patients with DLM was mainly related to symptom duration.

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Diagnostic criterion to distinguish between incomplete and complete discoid lateral meniscus on MRI

Cited by 26 publications

References 18 publications

T2 black lesions on routine knee MRI: differential considerations

T2 black lesions on routine knee MRI: differential considerations

Tibial eminence width can predict the presence of complete discoid lateral meniscus: A preliminary study

Effect of discoid lateral meniscus on tibiofemoral joint cartilage damage in middle-aged patients

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