Osteochondral Defect

Berndt and Harty radiographic classification of osteochondral lesions of the talus is as follows:
Stage I - Normal radiograph (subchondral compression fracture of the talus with no ligamentous sprain)

Stage II - Partially detached osteochondral fragment
Stage III - Complete, nondisplaced fracture remaining within the bony crater
Stage IV - Detached, loose osteochondral fragment



Anderson MRI classification of osteochondral lesions of the talus is as follows:
Stage I - Bone marrow edema (subchondral trabecular compression; radiograph results are negative with positive bone-scan findings)
Stage IIa - Subchondral cyst
Stage IIb - Incomplete separation of the osteochondral fragment
Stage III - Fluid around an undetached, undisplaced osteochondral fragment
Stage IV - Displaced osteochondral fragment

Case by Dr MGK Murthy, Sr Consultant Radiologist