Three-Point Dixon Chemical-Shift Imaging for Evaluating Articular Cartilage Defects in the Knee Joint on a Low-Field-Strength Open Magnet
M. A. Bredella1,
C. Losasso2,
S. C. Moelleken2,
R. W. Huegli1,
H. K. Genant1 and
P. F. J. Tirman3
1
Department of Radiology, University of California, 505 Parnassus Ave., San
Francisco, CA 94143-0628.
2
San Francisco Magnetic Resonance Center, 3333 California St., Ste. 105, San
Francisco, CA 94118.
3
National Orthopedic Imaging Associates, 1260 S. Eliseo Dr., Greenbrae, CA
94904.
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Fig. 1. —45-year-old woman with normal articular cartilage. Sagittal
two-dimensional three-point Dixon MR image (TR/TE, 2600/20) shows normal
hyaline cartilage along trochlear groove (straight arrows) and
lateral tibial plateau (curved arrow).
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Fig. 2. —64-year-old man with multiple patellar cartilage lesions.
Axial two-dimensional three-point Dixon MR image (TR/TE, 1200/36) shows
increased signal in lateral facet of patellar cartilage (black arrow)
that was read as grade 1 lesion and confirmed by arthroscopy. Medial patellar
facet shows partial thickness loss of articular cartilage that was interpreted
as grade 3 lesion and confirmed by arthroscopy (open arrow). Adjacent
to partial thickness defect, surface irregularity is noted
(arrowhead) that was read as grade 2 lesion and confirmed by
arthroscopy. Underlying bone marrow edema (white arrow) was thought
to represent early arthritic changes.
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Fig. 3. —60-year-old woman with grade 3 chondromalacia. Axial
two-dimensional three-point Dixon MR image (TR/TE, 1200/36) shows chondral
flap of lateral patellar facet (arrow) that was read as grade 3
chondromalacia and confirmed by arthroscopy. Normal articular cartilage is
seen adjacent to lesion (arrowheads).
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Fig. 4. —46-year-old man with grade 4 chondromalacia. Axial
two-dimensional three-point Dixon MR image (TR/TE, 1200/36) shows articular
cartilage loss down to bone of medial patellar facet (arrow) that was
interpreted as grade 4 lesion on MR imaging and confirmed by arthroscopy.
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Fig. 5. —54-year-old woman with knee pain. Axial two-dimensional
three-point Dixon MR image (TR/TE, 1200/36) shows increased signal intensity
of medial and lateral patellar facet (arrows) that was thought to
represent early chondromalacia, but was normal on arthroscopy.
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Fig. 6. —29-year-old man with knee pain. Sagittal two-dimensional
three-point Dixon MR image (TR/TE, 2600/20) shows increased signal intensity
without evidence of surface irregularity of lateral tibial plateau
(arrow) that was read as normal on MR imaging but was found to
represent grade 1 chondromalacia on arthroscopy.
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Copyright © 2001 by the American Roentgen Ray Society.
