Clinical and MRI Findings Associated with False-Positive Knee MR Diagnoses of Medial Meniscal Tears
Arthur A. De Smet1,
David H. Nathan2,
Ben K. Graf3,
Benjamin A. Haaland4 and
Jason P. Fine4
1 Department of Radiology, University of Wisconsin School of Medicine and Public
Health, 600 Highland Ave., E3/311, Madison, WI 53792.
2 Central Illinois Radiological Associates, Peoria, IL.
3 Department of Orthopedics and Rehabilitation Medicine, University of Wisconsin
School of Medicine and Public Health, Madison, WI.
4 Department of Biostatistics, University of Wisconsin School of Medicine and
Public Health, Madison, WI.
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Fig. 1A —18-year-old man with anterior cruciate ligament tear (not
shown) and false-positive MR diagnosis of medial meniscal tear at
meniscocapsular junction on MRI performed 39 days after injury; no tear was
seen at arthroscopy 59 days after injury. Sagittal proton
density–weighted (A) and T2-weighted (B) images show
linear intermediate-signal-intensity line (arrow in A) and
fluid-signal-intensity line (arrow in B) contacting superior
surface of meniscus at meniscocapsular junction. Bone contusion
(arrowhead in B) is seen in tibia.
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Fig. 1B —18-year-old man with anterior cruciate ligament tear (not
shown) and false-positive MR diagnosis of medial meniscal tear at
meniscocapsular junction on MRI performed 39 days after injury; no tear was
seen at arthroscopy 59 days after injury. Sagittal proton
density–weighted (A) and T2-weighted (B) images show
linear intermediate-signal-intensity line (arrow in A) and
fluid-signal-intensity line (arrow in B) contacting superior
surface of meniscus at meniscocapsular junction. Bone contusion
(arrowhead in B) is seen in tibia.
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Fig. 2A —36-year-old man who had injured his knee while squatting down
with true-positive MR diagnosis of medial meniscal tear at meniscocapsular
junction on MRI 21 days after injury; tear was confirmed at arthroscopy 30
days after injury. Anterior cruciate ligament tear was not identified.
Sagittal proton density–weighted (A) and T2-weighted (B)
images show linear intermediate-signal-intensity line (arrow in
A) and intermediate- and less-than-fluid-intensity line (arrow
in B) contacting superior surface of meniscus.
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Fig. 2B —36-year-old man who had injured his knee while squatting down
with true-positive MR diagnosis of medial meniscal tear at meniscocapsular
junction on MRI 21 days after injury; tear was confirmed at arthroscopy 30
days after injury. Anterior cruciate ligament tear was not identified.
Sagittal proton density–weighted (A) and T2-weighted (B)
images show linear intermediate-signal-intensity line (arrow in
A) and intermediate- and less-than-fluid-intensity line (arrow
in B) contacting superior surface of meniscus.
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Fig. 3A — 15-year-old girl with anterior cruciate ligament tear
(not shown) and false-positive diagnosis of medial meniscal tear at
meniscocapsular junction on MRI 1 day after injury; no tear was found at
arthroscopy 47 days after MRI. Sagittal proton density–weighted
(A) and T2-weighted (B) images show
intermediate-signal-intensity line (arrows in A) and
fluid-signal-intensity line (arrows in B) extending from
superior to inferior surfaces of meniscus.
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Fig. 3B — 15-year-old girl with anterior cruciate ligament tear
(not shown) and false-positive diagnosis of medial meniscal tear at
meniscocapsular junction on MRI 1 day after injury; no tear was found at
arthroscopy 47 days after MRI. Sagittal proton density–weighted
(A) and T2-weighted (B) images show
intermediate-signal-intensity line (arrows in A) and
fluid-signal-intensity line (arrows in B) extending from
superior to inferior surfaces of meniscus.
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Fig. 4A —39-year-old man with anterior cruciate ligament tear (not
shown) and true-positive diagnosis of medial meniscal tear in peripheral third
of meniscus on MRI 22 days after injury; tear was confirmed at arthroscopy 70
days after MRI. Sagittal proton density–weighted (A) and
T2-weighted (B) images show linear intermediate-signal-intensity line
(arrow in A) contacting superior surface of meniscus with
probable inferior contact as well and fluid-signal-intensity line
(arrow in B) contacting superior surface. Bone contusion
(arrowhead in B) is seen in tibia.
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Fig. 4B —39-year-old man with anterior cruciate ligament tear (not
shown) and true-positive diagnosis of medial meniscal tear in peripheral third
of meniscus on MRI 22 days after injury; tear was confirmed at arthroscopy 70
days after MRI. Sagittal proton density–weighted (A) and
T2-weighted (B) images show linear intermediate-signal-intensity line
(arrow in A) contacting superior surface of meniscus with
probable inferior contact as well and fluid-signal-intensity line
(arrow in B) contacting superior surface. Bone contusion
(arrowhead in B) is seen in tibia.
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