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Predictive Signs Of Peripheral Rim Instability With Magnetic Resonance Imaging In No-Shift-Type Complete Discoid Lateral Meniscus


Yusuke Hashimoto, MD, PhD
JAPAN

Predictive Signs Of Peripheral Rim Instability With Magnetic Resonance Imaging In No-Shift-Type Complete Discoid Lateral Meniscus

Yusuke Hashimoto, MD, PhD, JAPAN Kazuya Nishino, MD, JAPAN Shinya Yamasaki, MD, PhD, JAPAN Yohei Nishida, MD, JAPAN Hiroaki Nakamura, MD, PhD, JAPAN

Department of Orthopedic Surgery, Osaka City University, Graduate School of Medicine, Osaka, JAPAN

2021 Congress   Abstract Presentation   5 minutes   Not yet rated

 

Anatomic Location

Knee

Anatomic Structure

Meniscus Lateral

Diagnosis / Condition

Instability

Treatment / Technique

Arthroscopy

Patient Populations

Pediatric / Adolescent

Diagnosis Method

MRI

Sports Medicine

Outcome Studies

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Summary: A linear fluid signal at the anterior meniscus and anterior parameniscal soft-tissue edema were important signs of anterior peripheral rim instability, whereas bulging of the margin had high specificity but low sensitivity in detecting posterior peripheral rim instability on routine MRI of no-shift-type CDLM.

Purpose

To investigate the associations between the preoperative MRI ?ndings suggestive of meniscal instability and the intraoperative ?nding of peripheral rim instability (PRI) in patients with no-shift-type complete discoid lateral meniscus (CDLM).

Methods

The records of 47 patients diagnosed with no-shift-type CDLM who underwent arthroscopic surgery were reviewed. We evaluated MRI findings of increased intrameniscal signal, anterior parameniscal soft-tissue edema, linear fluid signal at the anterior meniscal margin, bulging of the meniscal margin, absence of popliteomeniscal fascicles, hiatus widening on routine MRI. The positive predictive value (PPV), sensitivity, and specificity of these findings in predicting PRI were calculated; PRI was further investigated according to anterior and posterior location.

Results

Linear fluid signal at the anterior meniscal margin and bulging had high PPV, specificity (P=.001 and =.003, respectively) for overall of PRI. The presence of either anterior parameniscal soft-tissue edema or linear fluid signal at the anterior meniscal margin predicted anterior PRI with high PPV, sensitivity, and specificity. BEither bulging of the meniscal margin (P=.014) had high specificity but low PPV and sensitivity in predicting posterior PRI.

Conclusions

A linear fluid signal at the anterior meniscus and anterior parameniscal soft-tissue edema were important signs of anterior PRI, whereas bulging of the margin had high specificity but low sensitivity in detecting posterior PRI on routine MRI of no-shift-type CDLM.

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