What is the main purpose of the Achilles reflex test?

The primary purpose of the Achilles reflex test is to assess the integrity of spinal nerves. This reflex test specifically evaluates the S1 and S2 spinal nerves, which are involved in the reflex arc associated with the Achilles tendon. When the Achilles tendon is tapped, it stimulates a reflex that causes the calf muscles to contract, resulting in plantar flexion of the foot. A normal response indicates that the associated spinal nerves are functioning properly, while an absent or diminished reflex may suggest potential issues with those nerves or their connection to the spinal cord. This test is a key component of neurological examinations and helps clinicians determine if there are any underlying neurological problems affecting the lower extremities.