AMR Sign: A Clinical Sign of Mechanical Integrity of Medial Meniscus

Introduction:Meniscus injury is now widely being diagnosed and managed. Meniscus acts as a shock absorber and transmits forces from femur to tibia. However, if the meniscus is torn, the hoop strength is lost. In hidden meniscus injuries, budding arthroscopy surgeons tend to miss the tear. AMR sign acts as a light-bearer for identifying the breach in the collagen architecture. Methods and Materials: 267 patients were included in the study. Informed written consent was taken from all the patients operated and included in the study. Following a fixed protocol of diagnostic arthroscopy, documentation of AMR sign and its relation with intactness of the medial meniscus was done. If medial meniscus tear was found, after repair, its relation with AMR sign was documented.

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High Posterior Tibial Slope Influence Medial Meniscus Injuries in ACL Deficient Knees

Revista de Chimie ◽

10.37358/rc.18.11.6734 ◽

2018 ◽

Vol 69 (11) ◽

pp. 3295-3298

Author(s):

Iulian Marcu ◽

Ana Maria Oproiu ◽

Nicolae Mihailide

Keyword(s):

Medial Meniscus ◽

Cruciate Ligament ◽

Tibial Slope ◽

Posterior Tibial Slope ◽

Meniscus Tear ◽

Meniscus Lesion ◽

Posterior Tibial ◽

Meniscus Lesions ◽

The Mean ◽

Meniscus Injuries

The purpose of the current study was to evaluate the correlation between the tibial slope and medial meniscus injury in anterior cruciate ligament deficient knees. A total of 223 patients with primary ACL injury admitted to Foisor Orthopedic Hospital between 2015-2016 were included in this study. The posterior tibial slope was evaluated on a lateral x-ray view of the knee and was defined as the angle between the line joining the tibial plateau and the line perpendicular to the longitudinal axis (the proximal tibial anatomical axis). Patients were divided into two groups depending on the posterior tibial slope ([9.9 and �10), and a Chi square test was used to evaluate if there is any correlation between this and internal meniscus injuries, and Fisher�s exact test was used to verify this. Overall medial meniscus lesions were found in 43.5% of the patients. The mean value of the posterior tibial slope was 11.19+/-2,685. After grouping patients in low and high group ([9.9 and �10), there were 66.8% in the high tibial slope group and 33.2% in the low group. In the high PTS group there were 93 patients with medial meniscus lesion (62.4%), and 56 (37.6%) without medial meniscus lesion. The mean posterior tibial slope was higher in the medial meniscus tear group (11.78 degrees), than mean PTS in the group without medial meniscus lesion (10.42 degrees). There was a strong correlation between high tibial slope and medial meniscus lesions (p=0.015). The main finding of the current study is that there is a statistically significant correlation between posterior tibial slope higher than 10 degrees and internal meniscus tears.

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Prevalence and effect of medial meniscus tear in elderly persons -the bunkyo health study

Osteoarthritis and Cartilage ◽

10.1016/j.joca.2020.02.463 ◽

2020 ◽

Vol 28 ◽

pp. S294-S295

Author(s):

H. Kaneko ◽

M. Ishijima ◽

T. Aoki ◽

Y. Negishi ◽

L. Liu ◽

...

Keyword(s):

Medial Meniscus ◽

Meniscus Tear ◽

Health Study ◽

Elderly Persons

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Partial meniscectomy provides the favorable outcomes for symptomatic medial meniscus tear with an intact posterior root

Knee Surgery Sports Traumatology Arthroscopy ◽

10.1007/s00167-019-05634-9 ◽

2019 ◽

Vol 28 (11) ◽

pp. 3497-3503 ◽

Cited By ~ 4

Author(s):

Jae-Young Kim ◽

Seong-Il Bin ◽

Jong-Min Kim ◽

Bum-Sik Lee ◽

Sung-Mok Oh ◽

...

Keyword(s):

Medial Meniscus ◽

Partial Meniscectomy ◽

Meniscus Tear ◽

Posterior Root

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Concomitant medial meniscus tear and focal chondral defect of the medial femoral condyle

Chondral Disease of the Knee ◽

10.1007/978-0-387-38299-9_5 ◽

2006 ◽

pp. 14-16

Author(s):

Brian J. Cole

Keyword(s):

Medial Meniscus ◽

Femoral Condyle ◽

Medial Femoral Condyle ◽

Meniscus Tear ◽

Chondral Defect

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Muscular Force Patterns during Level Walking in ACL-Deficient Patients with a Concomitant Medial Meniscus Tear

Applied Bionics and Biomechanics ◽

10.1155/2019/7921785 ◽

2019 ◽

Vol 2019 ◽

pp. 1-8 ◽

Cited By ~ 1

Author(s):

Hongshi Huang ◽

Wei Yin ◽

Shuang Ren ◽

Yuanyuan Yu ◽

Si Zhang ◽

...

Keyword(s):

Stance Phase ◽

Medial Meniscus ◽

Rectus Femoris ◽

Cartilage Degeneration ◽

Meniscus Tear ◽

Muscular Force ◽

Acl Deficiency ◽

Level Walking ◽

Significant Difference ◽

Acl Deficient

Background. The abnormal knee joint motion patterns caused by anterior cruciate ligament (ACL) deficiency are thought to be associated with articular cartilage degeneration. High rates of meniscus tear combined with ACL rupture are observed, and these knees suffer a higher risk of early cartilage degeneration. Research Question. This study investigated lower limb muscular force patterns of ACL-deficient knees with a concomitant medial meniscus tear. Methods. 12 volunteers and 22 patients were recruited, including 12 patients with isolated ACL deficiency (ACLD) and 10 ACL-deficient patients with a concomitant medial meniscus tear (ACLDM). Level walking data at a self-selected speed were collected before surgery. Then, a musculoskeletal dynamic analysis system, AnyBody, was applied to simulate tibiofemoral flexion moments and muscle forces. Results. Our results indicate that the tibiofemoral peak flexion and extension moments in ACLDM patients are significantly lower than in controls. The rectus femoris force in ACLDM patients was significantly lower than in isolated ACL-deficient patients and the controls during mid and terminal stance phase, while no significant difference was found in hamstring and vastus force. Additionally, the gastrocnemius force in ACL-deficient patients both with and without a medial meniscus tear was lower than in controls during mid-stance phase. Significance. The ACLDM patients had lower peak tibiofemoral flexion moment, lower gastrocnemius force in mid-stance phase, and lower rectus femoris force during the mid and terminal stance phase. These results may help clinicians to better understand the muscle function and gait pattern in ACL-deficient patients with a concomitant medial meniscus tear.

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Meniscus tear developed by pulling of the anomalous insertion of medial meniscus on anterior cruciate ligament

Knee Surgery Sports Traumatology Arthroscopy ◽

10.1007/s00167-011-1464-6 ◽

2011 ◽

Vol 19 (10) ◽

Cited By ~ 2

Author(s):

Joon Ho Wang ◽

Andrew K. Wong ◽

James R. Romanowski ◽

Freddie H. Fu

Keyword(s):

Anterior Cruciate Ligament ◽

Medial Meniscus ◽

Cruciate Ligament ◽

Meniscus Tear ◽

Anomalous Insertion ◽

Anterior Cruciate

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Medial and lateral meniscus have a different role in kinematics of the ACL-deficient knee: a systematic review

Journal of ISAKOS Joint Disorders & Orthopaedic Sports Medicine ◽

10.1136/jisakos-2019-000293 ◽

2019 ◽

Vol 4 (5) ◽

pp. 233-241

Author(s):

Alberto Grassi ◽

Giacomo Dal Fabbro ◽

Stefano Di Paolo ◽

Federico Stefanelli ◽

Luca Macchiarola ◽

...

Keyword(s):

Systematic Review ◽

Medial Meniscus ◽

Lateral Meniscus ◽

Meniscus Tear ◽

Pivot Shift Test ◽

Anterior Tibial ◽

Kinematic Evaluation ◽

Tibial Translation ◽

Acl Deficient ◽

Deficient Knee

ImportanceMeniscal tears are frequently associated with anterior cruciate ligament (ACL) injury and the correct management of this kind of lesion during ACL-reconstruction procedure is critical for the restoration of knee kinematics. Although the importance of meniscus in knee biomechanics is generally accepted, the influence of medial and lateral meniscus in stability of ACL-deficient knee is still unclear.ObjectiveThe aim of this study was to review literature, which analysed effects in cadaveric specimens of meniscal tear and meniscectomy of medial and lateral meniscus on laxity in the ACL-deficient knee.Evidence reviewAuthors performed a systematic search for cadaveric studies analysing the effect of medial and lateral meniscus tears or resection on kinematics of ACL-deficient knee. Extracted data included year of publications, number of human cadaver knee specimens, description of apparatus testing and instrumented kinematic evaluation, testing protocol and results.FindingsAuthors identified 18 studies that met inclusion and exclusion criteria of current review. The major finding of the review was that the works included reported a difference role of medial and lateral meniscus in restraining ACL-deficient knee laxity. Medial meniscus tear or resection resulted in a significant increase of anterior tibial displacement. Lateral meniscus lesions or meniscectomy on the other hand significantly increased rotation and translation under a coupled valgus stress and internal-rotation torque/pivot shift test.ConclusionsMedial and lateral meniscus have a different role in stabilising the ACL-deficient knee: while the medial meniscus functions as a critical secondary stabilisers of anterior tibial translation under an anterior/posterior load, lateral meniscus appears to be a more important restraint of rotational and dynamic laxity.Level of evidenceLevel IV, systematic review of level I–IV studies.

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