Foot and ankle
Talar dome - tibial plafond distance
Varus stress (instability)
Δ >3 mm
Radiography (Anteroposterior)
A difference of more than 3 mm between the normal and pathologic side measured between the talar dome and tibial plafond during varus stress test is highly suggestive of ankle instability.
Reference
Berquist TH. Imaging of the Foot and Ankle. Lippincott Williams & Wilkins. p. 117 (2010).
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