Osteochondral Lesion of the Talus - MSK Radiology
• Typical location of the osteochondral defect along the medial talar dome with subchondral lucency on x-ray and surrounding sclerosis on Tl -sequence.
• Linear T 2-hyperintense fluid-signal rim at the interface between the fragment and parent bone which is not detached. (Berndt & Harty staging: Fragment incompletely undercut by fluid signal → stage 11b)
• Osteochondral lesion: umbrella term for focal articular cartilage and cortical injury.
• Osteochondral injury: used for acute/subacute lesions
• Osteochondritis dissecans: chronic osteochondral defect
MOST IMPORTANT: Size of defect and assessment of stability
Unstable lesion MR findings:
• Fluid (T2-signal) extends completely around fragment
• Fluid-filled cysts deep to lesion
• Avascular necrosis (serpentine line, normal cartilage until late), Osteoarthritis, Subchondral Insufficiency Fracture (SIF)
Dr. Donald von Borstel @DrvonBorstel
#Osteochondral #Lesion #clinical #mri #clinical #Radiology #diagnosis #msk