Table 1:
Radiographic classification of transchondral fractures of the talus.
Stage
Definition
I
Compression fracture with intact overlying cartilage
II
Incomplete avulsion of an osteochondral fragment
III
Complete avulsion of an osteochondral fragment without displacement
IV
Avulsed fragment displaced into joint
Berndt AL, Harty M. Transchondral fractures (osteochondritis dissecans) of the talus. J Bone Joint Surg Am. 1959;41-A:988-1020.