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Imaging of Patellar Cartilage with a 2D Multiple-Echo Data Image Combination Sequence

Marius R. Schmid1, Christian W. A. Pfirrmann1, Peter Koch2, Marco Zanetti1, Bernd Kuehn3 and Juerg Hodler1

1 Department of Radiology, University Hospital Balgrist, Forchstrasse 340, Zurich CH-8008, Switzerland.
2 Department of Orthopedic Surgery, University Hospital Balgrist, Zurich CH-8008, Switzerland.
3 MR Applications Development, Siemens Medical Solutions, Erlangen, Germany.



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  		Fig. 1. —Schematic drawing illustrates multiple-echo data image combination (MEDIC) sequence. HF = high frequency, GS = slice-selection gradient, GP = phase-detection gradient, GB = readout gradient, ADC = analog-to-digital converter.

 


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  		Fig. 2. —Grade 1 and 2 cartilage lesions. Axial image acquired with multiple-echo data image combination (MEDIC) sequence (TR/TE, 884/26; flip angle, 30°) shows grade 1 (curved arrows) and arthroscopically verified grade 2 (straight arrows) cartilage lesions in 57-year-old man. Cartilage signal irregularity in lateral facet (grade 1 lesion; curved arrows) and thinning of cartilage to less than half of thickness of normal cartilage (grade 2; straight arrows) are seen in central part of retropatellar cartilage.

 


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  		Fig. 3. —Grade 3 cartilage lesion. Axial image acquired with multiple-echo data image combination (MEDIC) sequence (TR/TE, 884/26; flip angle, 30°) shows arthroscopically proven grade 3 cartilage lesion (arrow) in left knee of 49-year-old man. Fissuring to level of subchondral bone in medial facet of retropatellar cartilage is present.

 


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  		Fig. 4. —Grade 4 cartilage lesion. Axial image acquired with multiple-echo data image combination (MEDIC) sequence (TR/TE, 884/26; flip angle, 30°) shows arthroscopically proven grade 4 cartilage lesion (arrows) in right knee of 55-year-old woman. Exposed subchondral bone in medial facet of retropatellar cartilage is seen.

 

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