As the strongest tendon of the human body, the Achilles tendon originates from the soleus and gastrocnemius muscles, and inserts onto the posterior calcaneal tuberosity. The tendon is surrounded by a paratenon rather than a synovial sheath. Sonography is an efficient and accurate way to assess the Achilles tendon. Advantages of sonographic evaluation include cost, widely available equipment, ease of contralateral comparison, and the ability to image during joint motion.