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Oblique MR imaging of the anterior cruciate ligament based on three-dimensional orientation

✍ Scribed by Martin J. Breitenseher; Marius E. Mayerhoefer

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
258 KB
Volume
26
Category
Article
ISSN
1053-1807

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✦ Synopsis

Abstract

Purpose

To investigate the three‐dimensional (3D) course of the anterior cruciate ligament (ACL) and determine the optimum planes for oblique full‐length MRI of the ligament.

Materials and Methods

Twenty‐five healthy volunteers were examined. Axial proton density‐weighted (PDw) images of the knees of 20 volunteers were obtained. 3D paths along the course of the ACL and corresponding tangents were constructed. Angles between these tangents and reference lines RFL‐1 (the line connecting the posterior edges of the femoral condyles), RFL‐2 (the line through the intercondylar joint space), and RFL‐3 (the line connecting the anterior and posterior edge of the medial tibial condyle) were measured. These angles were used for oblique T2‐weighted (T2w) MRI of the knees of the remaining five volunteers, and the number of slices that depicted the entire ACL was calculated.

Results

The mean angles to the ACL were 74.0° for RFL‐1, 79.9° for RFL‐2, and 70.4° for RFL‐3. Full‐length visualization of the ACL was demonstrated by 1.4 slices using the sagittal oblique plane prescribed for RFL‐1, 2.4 slices using the sagittal oblique plane prescribed for RFL‐2, and 1.4 slices using the coronal oblique plane prescribed for RFL‐3.

Conclusion

The ACL is best depicted using a sagittal oblique imaging plane angled at 80° from a line through the intercondylar joint space. J. Magn. Reson. Imaging 2007;26:794–798. © 2007 Wiley‐Liss, Inc.

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