What is a characteristic symptom of an Achilles tendon rupture?

A characteristic symptom of an Achilles tendon rupture is the sudden sharp pain followed by an inability to plantar flex the foot. This injury typically occurs during activities that involve sudden acceleration or changes in direction, such as playing sports. When the Achilles tendon, which connects the calf muscles to the heel bone, ruptures, the individual often experiences a distinct and immediate pain in the back of the ankle or calf, commonly described as feeling like a "gunshot" or a sudden snapping sensation.

Following this initial pain, the individual typically struggles to perform movements that require plantar flexion, such as pushing off with the foot when walking or running, which is a direct result of the tendon being unable to function properly after the rupture. This inability to plantar flex is a hallmark sign of this specific injury and helps differentiate it from other conditions that may involve discomfort or swelling in the ankle area.