What does a positive Thompson's Test indicate?

• A. Ruptured Achilles tendon
• B. Anterior cruciate ligament tear
• C. Shoulder dislocation
• D. Sprain of the ankle

Answer: (A)

Thompson's test checks the Achilles tendon. When you squeeze the calf, a normal, intact Achilles allows the gastrocnemius-soleus complex to pull on the heel, producing plantarflexion. If the tendon is ruptured, squeezing the calf doesn’t cause the foot to plantarflex, so you see little to no movement. That absence of plantarflexion with the calf squeeze is what makes the test positive and indicates an Achilles tendon rupture. This test specifically evaluates the Achilles tendon and isn’t used to diagnose ACL tears, shoulder dislocations, or ankle sprains, which involve different structures and tests.