A positive Thompson test is indicative of an Achilles tendon rupture. What is the observed response in a normal, intact Achilles tendon when the calf muscle is forcefully squeezed?

Explanation:
The Thompson test (calf squeeze test) reliably evaluates Achilles tendon continuity. Squeezing the calf muscle belly normally pulls on an intact Achilles tendon, causing passive plantar flexion of the foot. Absence of this movement strongly indicates a full-thickness rupture. Reference: Mann's Surgery of the Foot and Ankle.