A positive Thompson test indicates a tear of which tendon?

A positive Thompson test indicates a tear of which tendon?

• A. Achilles tendon
• B. Tibialis anterior
• C. Peroneus brevis
• D. Flexor digitorum longus

Answer: (A)

The Thompson test checks the Achilles tendon’s integrity. When the calf is squeezed, a normal, intact Achilles allows the foot to plantarflex. If the tendon is ruptured, squeezing the calf doesn’t produce plantarflexion or only minimal movement. That direct link to the Achilles makes this test the best way to identify a rupture of that tendon. The other tendons listed aren’t tested by this maneuver. The tibialis anterior controls dorsiflexion, the peroneus brevis contributes to foot eversion, and the flexor digitorum longus flexes the toes. A positive Thompson test specifically points to an Achilles tendon rupture, not issues with those other tendons. Keep in mind that partial tears or swelling can affect the response, and imaging may be needed for confirmation.

The Thompson test checks the Achilles tendon’s integrity. When the calf is squeezed, a normal, intact Achilles allows the foot to plantarflex. If the tendon is ruptured, squeezing the calf doesn’t produce plantarflexion or only minimal movement. That direct link to the Achilles makes this test the best way to identify a rupture of that tendon.

The other tendons listed aren’t tested by this maneuver. The tibialis anterior controls dorsiflexion, the peroneus brevis contributes to foot eversion, and the flexor digitorum longus flexes the toes. A positive Thompson test specifically points to an Achilles tendon rupture, not issues with those other tendons.

Keep in mind that partial tears or swelling can affect the response, and imaging may be needed for confirmation.