Which test is used to document a lower-extremity injury?

• A. Thompson
• B. Ankle radiograph
• C. MRI
• D. Pes planus test

Answer: (A)

The key concept is bedside assessment of Achilles tendon integrity after a lower-extremity injury. The Thompson test works by squeezing the calf; with an intact Achilles tendon, the gastrocnemius–soleus contraction should cause the foot to plantarflex. If the tendon is ruptured, there is little to no plantarflexion, confirming the rupture at the bedside. This makes it the most direct and rapid way to document a tendon injury in the lower limb.

An ankle radiograph is useful if you suspect a fracture or dislocation, but it doesn’t assess tendon integrity. MRI can visualize soft tissue injuries, including ruptures, but it’s not the immediate bedside test. The pes planus test isn’t a standard test for acute tendon injuries.