The Thompson test . To perform this test, have the patient lie prone with the foot over the edge of the examination table, or with the knee flexed to ninety degrees. The examiner then squeezes the gastrocnemius soleus complex, which should cause plantarflexion of the foot. The test is considered positive and is suggestive of a complete Achilles tendon rupture if the foot fails to plantarflex.
- Pearl: Thompson test is done passively, with the patient prone with their foot overlying the examination table, so as to isolate the gastrocnemius/soleus complex.