Ring-shaped lateral meniscus with hypoplasic anterior cruciate ligament

Esteves, Cátia; Castro, Ricardo; Cadilha, Rui; Raposo, Frederico; Melão, Lina

doi:10.1007/s00256-015-2197-2

Cited by 16 publications

(10 citation statements)

References 22 publications

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“…There have been multiple reports on meniscal malformations, which are categorized into three groups: hyperplastic (discoid, double-layered [ 2 ], abnormal band [ 9 ], accessory [ 10 ], and ring-shaped [ 11 ]), hypoplastic (absence [ 12 ], partial deficiency [ 13 ], and separation [ 14 ]), and insertional anomalies. It does not seem difficult to differentiate PSLM from meniscal malformations, because PSLM does not involve any malformation.…”

Section: Discussionmentioning

confidence: 99%

A Case of Bilateral Permanent Subluxation of the Lateral Meniscus

Suganuma

Sugiki

Inoue

2016

Case Reports in Orthopedics

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We report a case of bilateral, permanent subluxation of the lateral meniscus. To our knowledge, the present case is the first reported description of bilateral irreducible anterior dislocation of the posterior segment of the lateral meniscus. This disorder is characterized by a flipped meniscus sign of the lateral meniscus on sagittal magnetic resonance images of the knee joint, with no history of trauma or locking symptoms. A detailed examination of serial magnetic resonance images of the lateral meniscus can help differentiate this condition from malformation of the lateral meniscus, that is, a double-layered meniscus. We recommend two-stage treatment for this disorder. First, the knee joint is kept in straight position for 3 weeks after the lateral meniscus is reduced to the normal position. Second, if subluxation of the lateral meniscus recurs, meniscocapsular suture is then performed. Although subluxation of the lateral meniscus without locking symptoms is rare, it is important to be familiar with this condition to diagnose and treat it correctly.

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Section: Discussionmentioning

confidence: 99%

A Case of Bilateral Permanent Subluxation of the Lateral Meniscus

Suganuma

Sugiki

Inoue

2016

Case Reports in Orthopedics

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“…Physicians should be made aware that visualization of the MFLs is challenging because they can be mistaken for meniscal tears or rare anatomic variants, such as ring-shaped lateral menisci. 21 Since its identification, this ligament has continued to demonstrate function beyond anteroposterior passive resistance and rotatory laxity. 4,26 Such a hypothesis is supported by reports that the presence of the pMFL correlates with a smaller PCL cross-sectional area.…”

Section: Discussionmentioning

confidence: 99%

Clinical Anatomy of the Posterior Meniscofemoral Ligament of Wrisberg: An Original MRI Study, Meta-analysis, and Systematic Review

Pękala

Łazarz

Rosa

et al. 2021

Orthopaedic Journal of Sports Medicine

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Background: The posterior meniscofemoral ligament (pMFL) of Wrisberg attaches to the posterior horn of the lateral meniscus and the lateral intercondylar aspect of the medial femoral condyle and passes posteriorly to the posterior cruciate ligament (PCL). The pMFL plays a role in recovery after PCL injuries and offers stability to the lateral meniscus, promoting normal knee function. Purpose/Hypothesis: The aim of the magnetic resonance imaging (MRI) arm of this study was to evaluate the prevalence of the pMFL in Polish patients. The purpose of the systematic review and meta-analysis was to evaluate the clinical relevance of the pMFL in knee surgery. It was hypothesized that extensive variability exists in reports on the prevalence, function, and clinical significance of the pMFL. Study Design: Cross-sectional study and systematic review; Level of evidence, 3. Methods: A retrospective MRI investigation was conducted on 100 randomly selected lower limbs of Polish patients (56 male, 44 female) performed in 2019 to determine the prevalence of the pMFL. Additionally, an extensive literature search of major online databases was performed to evaluate all reported data on the pMFL. Assessments of article eligibility and data extraction were completed independently by 2 reviewers, and all disagreements were resolved via a consensus. A quality assessment of the included articles was performed using the Anatomical Quality Assessment tool. Results: In the MRI arm of this study, the pMFL was observed in 73 of the 100 limbs. In the meta-analysis, 47 studies were included, totaling 4940 lower limbs. The pooled prevalence of the pMFL was found to be 70.4% (95% CI, 63.4%-76.9%); the mean length was 27.7 mm (95% CI, 24.8-30.5 mm) and the mean widths were 4.5, 6.1, and 4.1 mm for the meniscal and femoral attachments and midportion, respectively. The mean pMFL thickness was 2.3 mm (95% CI, 1.8-2.7 mm). Conclusion: Despite the variability in the literature, the pMFL was found to be a prevalent and large anatomic structure in the knee joint. The shared features of this ligament with the PCL necessitate the consideration of its value in planning and performing arthroscopic procedures of the knee.

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“…In the sagittal plane of MRI, "central bow tie sign" is useful in detecting the normal meniscal tissue onto the inner portion of the lateral compartment of the knee. 8 In the coronal plane, the inner portion of the lateral meniscus is in the medial portion of the lateral compartment and not in the intercondylar notch, and the presence of the "mirror sign" in which the inner portion of the ring-shaped lateral meniscus is the mirror image or reflection of the normal appearing body of the meniscus. 8 A double-layered meniscus is extremely uncommon and one of the forms of accessory meniscus.…”

Section: Discussionmentioning

confidence: 99%

“…8 In the coronal plane, the inner portion of the lateral meniscus is in the medial portion of the lateral compartment and not in the intercondylar notch, and the presence of the "mirror sign" in which the inner portion of the ring-shaped lateral meniscus is the mirror image or reflection of the normal appearing body of the meniscus. 8 A double-layered meniscus is extremely uncommon and one of the forms of accessory meniscus. In all cases reported in the literature, it was overlying the normal lateral meniscus.…”

Section: Discussionmentioning

confidence: 99%

Ring-shaped lateral meniscus combined with an accessory meniscus: A rare anatomical variant

Lee

Yang

Kim

et al. 2019

J Orthop Surg (Hong Kong)

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A ring-shaped meniscus is a very rare anatomical variant among all meniscal abnormalities. Additionally, an accessory meniscus is extremely rare, and only a few cases have been reported. We herein report a case involving the combination of these two features in a single lateral meniscus. These abnormalities were found during arthroscopic surgery for removal of an osteochondral fragment that had detached from the patellar bone and plication of the medial patellofemoral ligament in a patient with acute patellar dislocation. To our knowledge, each variant is extremely rare and the combination of the two variants has not been reported.

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Ring-shaped lateral meniscus with hypoplasic anterior cruciate ligament

Cited by 16 publications

References 22 publications

A Case of Bilateral Permanent Subluxation of the Lateral Meniscus

A Case of Bilateral Permanent Subluxation of the Lateral Meniscus

Clinical Anatomy of the Posterior Meniscofemoral Ligament of Wrisberg: An Original MRI Study, Meta-analysis, and Systematic Review

Ring-shaped lateral meniscus combined with an accessory meniscus: A rare anatomical variant

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