J Korean Radiol Soc.  2007 Aug;57(2):167-174. 10.3348/jkrs.2007.57.2.167.

The Role of an Axial MR Scan on the Diagnosis of a Meniscal Tear of the Knee Joint

• Yeom SK
• Kim BH
• Hong SJ
• Seol HY

• KMID: 2103876
• DOI: http://doi.org/10.3348/jkrs.2007.57.2.167

Abstract

PURPOSE
To evaluate the role of standard axial MR images for the diagnosis of meniscal tears of the knee.
MATERIALS AND METHODS
Forty-five patients with a prior MRI examination that underwent arthroscopic surgery of the knee due to clinical impression of a meniscal tear were included in the study group. The sequence for meniscal evaluation was an axial fat-saturated proton density-weighted image with a 4 mm slice thickness. Axial MR images were independently reviewed by two radiologists and were compared with findings of arthroscopy. The sensitivity, specificity, positive predictive value, negative predictive value and accuracy of the axial MR scan for the diagnosis of the meniscal tear were calculated.
RESULTS
A total 90 menisci of 45 patients were evaluated in the axial MR scans. Forty-two patients had meniscal tears, and two of the patients had tears in both menisci; thus, a total of44 meniscal tears were found by arthroscopy. For meniscal tears, the sensitivity of the axial plane was 76.2%, the specificity was 89.1% and the accuracy was 81.1%. False negative meniscal tears were seen in 12 cases and false positive meniscal tears were seen in 5 cases on the axial MR images.
CONCLUSION
In standard knee MRI examinations, axial images may be valuable for the detection and localization of meniscal tears.

Keyword

Knee; Medial collateral ligament, knee; Menisci, tibial; Knee injury; Magnetic resonance imaging (MRI)

MeSH Terms

Arthroscopy
Diagnosis*
Humans
Knee Injuries
Knee Joint*
Knee*
Magnetic Resonance Imaging
Medial Collateral Ligament, Knee
Menisci, Tibial
Protons
Sensitivity and Specificity
Protons