mri knee 3
TRANSCRIPT
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1. Grade I sprain (Low-Grade partial tear)
• Signal around ACL
• The fibres of the ligament are stretched, and
we can see more than 50% of its fibres intact.
2. Grade II sprain (High-Grade partial tear)
• Signal within ACL
• We can see less than 50% of fibres intact.
3. Grade III tear (Complete ACL tear)
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Grade I sprain
(Low-Grade partial tear)
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Grade II sprain
(High-Grade partial tear)
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Grade III tear (Complete ACL tear)
1. Discontinuous fibers
2. Non-visible fibers
3. Abnormal slope of the ligament
4. Empty notch sign
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Grade III tear
(Complete ACL tear)
Discontinuous fibers
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Grade III tear
(Complete ACL tear)
Non-visible fibers
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Grade III tear
(Complete ACL tear)
Abnormal slope of the ligament
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Grade III tear
(Complete ACL tear)
Abnormal slope of the ligament
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Grade III tear
(Complete ACL tear)
Abnormal slope of the ligament
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Grade III tear
(Complete ACL tear)
Abnormal slope of the ligament
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Grade III tear
(Complete ACL tear)
Empty notch sign
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Grade III tear
(Complete ACL tear)
Empty notch sign
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1. Grade I Sprain
• High Signal superficial to the collateral ligament
• The fibres of the ligament are stretched, and
apparently intact
2. Grade II Sprain (Partial Tear)
• Signal within the collateral ligament with disrupted
and intact fibres
3. Grade III Tear (Complete Tear)
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Grade I Sprain
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Grade II Sprain
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Grade II Sprain
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Grade II Sprain
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Grade II Sprain
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Grade III Sprain
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Grade III Sprain
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Sequence Bone Cartilage Fluid
T1 Signal Void Iso Hypo
T2 Signal Void Hypo Bright
PDFS Signal Void Hyper Bright
Gradient Signal Void Hyper Bright
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Grade MRI finding
I Focal signal intensity changes without contour deformity
(difficult to assess on MRI)
II Focal signal intensity change and contour bulge (partial
thickness)
III Focal signal intensity change, contour irregularities,
cartilage thinning and fluid extension into cartilage (full
thickness)
IV Similar to stage III with defects extending to the cortical
bone (with subchondral bony changes)
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