“ This typically occurs in adolescents and young adults. It is a common cause of anterior knee pain associated with trauma, chronic stress a...
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This typically occurs in adolescents and young adults. It is a common cause of anterior knee pain associated with trauma, chronic stress and patella instability.
There is
- softening and oedema of the articular cartilage (grade I);
- this may progress to fissure/fragmentation less than 1.3 cm diameter (grade II),
- fissure/fragmentation >1.3 cm (grade III) and
- full-thickness cartilage loss (grade IV).
May heal or progress to osteoarthritis.
PLAIN FILM
• Insensitive, shows non-specific loss of joint space.
MRI
• Axial T2-weighted/intermediate-weighted imaging with fat suppression.
• Thinning of the cartilage in the patella-femoral joint.
• Joint fluid extends to the bone with full-thickness cartilage defects.
• Look for bone oedema and subchondral cystic change.
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