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European Radiology

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01.01.2011 | Musculoskeletal

Magnetic resonance diagnosis of posterior horn tears of the lateral meniscus using a thin axial plane: the zip sign—a preliminary study

verfasst von: P. Y. Savoye, J. N. Ravey, C. Dubois, L. Pittet Barbier, A. Courvoisier, D. Saragaglia, G. Ferretti

Erschienen in: European Radiology | Ausgabe 1/2011

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Abstract

Objective

The “zip” sign is a newly described form of meniscal tear progressing from the distal insertion of menisco-femoral ligaments (MFLs) through the lateral meniscal wall; the tear occurs during anterior cruciate ligament (ACL) rupture. The purpose of this study was to evaluate the zip sign on knee MRI within the context of ACL injuries.

Methods

From a series of 261 MR examinations for acute knee injury, we selected 97 patients with both MR and arthroscopic data for a retrospective blinded review. The zip sign was defined on axial thin MR sections as a straight line from the distal insertion of MFLs in association with five sagittal images lateral to the posterior cruciate ligament (PCL) where the MFLs were identified. Sensitivity and specificity in detecting lateral meniscal tears before and after having defined the zip sign were calculated.

Results

Sensitivity in detecting the tears of the posterior horn of the lateral meniscus (PHLM) reached 87.5% (CI 0.68–0.97) after zip sign criteria were defined. The zip sign has excellent inter-observer agreement, К > 0.90.

Conclusion

The zip sign indicates a lesion at the insertion site of MFLs into the PHLM on thin axial images associated with sagittal MR sections that may improve MR sensitivity in detecting PHLM tears.

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Titel: Magnetic resonance diagnosis of posterior horn tears of the lateral meniscus using a thin axial plane: the zip sign—a preliminary study
verfasst von: P. Y. Savoye
J. N. Ravey
C. Dubois
L. Pittet Barbier
A. Courvoisier
D. Saragaglia
G. Ferretti
Publikationsdatum: 01.01.2011
Verlag: Springer-Verlag
Erschienen in: European Radiology / Ausgabe 1/2011
Print ISSN: 0938-7994
Elektronische ISSN: 1432-1084
DOI: https://doi.org/10.1007/s00330-010-1882-8

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Magnetic resonance diagnosis of posterior horn tears of the lateral meniscus using a thin axial plane: the zip sign—a preliminary study