BERNDT & HARDY (J Bone Joint Surg, 41A:988-1020, 1959)
Stage 1 – nondisplaced compression of talar dome
Stage 2 – partially detached osteochondral lesion
Stage 3 – completely detached, nondisplaced osteochondral lesion
Stage 4 – completely detached, displaced osteochondral lesion
Mechanism of Injury: DIAL a PIMP
DIAL – Dorsiflexion and Inversion of foot = Anterior-Lateral talus lesion
PIMP – Plantarflexion and Inversion of foot = Posterior-Medial talus lesion
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