Introduction:

The Achilles reflex, also known as the ankle jerk reflex, is a test of the nervous system that is commonly performed during a physical exam. It involves tapping the Achilles tendon, which is located at the back of the ankle, to see if the foot moves in response. In this article, we will discuss what the Achilles reflex is, how it works, what abnormal results may indicate, and how it is performed.

What is the Achilles reflex?

The Achilles reflex is a test of the nervous system that helps to evaluate the function of the S1 nerve root, which is located in the lower back. The test involves tapping the Achilles tendon with a reflex hammer to see if the foot moves in response.

How does the Achilles reflex work?

The Achilles reflex works by stimulating the S1 nerve root, which sends a signal to the muscles in the calf and foot to contract. This contraction causes the foot to move in a reflexive manner.

What do abnormal results of the Achilles reflex indicate?

Abnormal results of the Achilles reflex may indicate a problem with the nervous system, such as:

• Nerve damage or compression
• Herniated disc in the lower back
• Multiple sclerosis
• Amyotrophic lateral sclerosis (ALS)
• Parkinson's disease
• Guillain-Barré syndrome

How is the Achilles reflex performed?

The Achilles reflex is typically performed while the patient is lying down or sitting with their feet hanging over the edge of the examination table. The doctor will tap the Achilles tendon with a reflex hammer, which will cause the foot to move in a reflexive manner.

Conclusion:

The Achilles reflex is a test of the nervous system that helps to evaluate the function of the S1 nerve root. Abnormal results of the test may indicate a problem with the nervous system, such as nerve damage or compression, herniated disc, or neurological disorders. The test is performed by tapping the Achilles tendon with a reflex hammer while the patient is lying down or sitting.

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