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- Title
Using three-dimensional isotropic SPACE MRI to detect posterolateral corner injury of the knee.
- Authors
Ahn, Su Joa; Jeong, Yu Mi; Lee, Beom Goo; Sim, Jae Ang; Choi, Hye-Young; Kim, Jeong Ho; Lee, Sheen-Woo
- Abstract
<bold>Background: </bold>Reliable magnetic resonance imaging (MRI) diagnosis is important in cases of posterolateral corner (PLC) injury due to the limitations of physical examination in patients with multi-ligament injury. <bold>Purpose: </bold>To document the appearance of PLC of the knee on three-dimensional (3D) isotropic MR images, and to determine the significance of MRI findings in patients with confirmed posterolateral rotatory instability. <bold>Material and Methods: </bold>Twenty-five patients that underwent surgery for posterolateral instability, and 25 individuals with normal MRI constituted the study cohort. The PLC appearances (popliteofibular, fabellofibular, arcuate ligaments, popliteomeniscal fascicle) were analyzed using 3D isotropic proton density sequence and routine two-dimensional (2D) MRI. In addition, the "fibular cap" sign was evaluated. Statistical analysis was performed using the Chi-square and McNemar's tests. <bold>Results: </bold>Thickening of popliteofibular, fabellofibular, arcuate ligaments, and popliteomeniscal fascicle was significantly more frequent in the PLC injury group than in the control group (P < 0.05). The sensitivity and specificity of 3D MRI for popliteofibular, fabellofibular, arcuate ligaments, and popliteomeniscal fascicle injury were 63/92%, 54/100%, 46/100%, and 58/92%, respectively. On comparing 3D and 2D images with respect to injury detectability (grade 3 or 4), both modalities visualized injuries, but 3D detected grade 3 or grade 1 rather than grade 4 or 0, respectively. The fibular cap sign was observed significantly more frequently in PLC group, with 58% sensitivity and 100% specificity, and was better observed by 3D than 2D (P < 0.05). <bold>Conclusion: </bold>3D MRI is a valid modality for detecting PLC abnormalities as it visualizes pathologies in each component and exhibits the positive fibular cap sign.
- Subjects
LIGAMENT injuries; MAGNETIC resonance imaging; MEDICAL imaging systems; THREE-dimensional imaging; POSTEROLATERAL corner; KNEE injuries; DIAGNOSTIC imaging; COMPUTERS in medicine; TREATMENT effectiveness
- Publication
Acta Radiologica, 2016, Vol 57, Issue 10, p1251
- ISSN
0284-1851
- Publication type
journal article
- DOI
10.1177/0284185115626470