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Percussion Hammer – Reflex Hammer in Medicine

A percussion hammer is a medical examination instrument used to test reflexes and assess body tissues by tapping specific areas of the body.

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Things worth knowing about "Percussion Hammer"

A percussion hammer is a medical examination instrument used to test reflexes and assess body tissues by tapping specific areas of the body.

What is a Percussion Hammer?

A percussion hammer (also called a reflex hammer) is a simple yet essential medical examination tool. It is used by physicians and healthcare professionals to elicit reflexes and evaluate body tissues by tapping specific anatomical locations. The instrument typically consists of a handle and a rubber head that delivers a controlled mechanical stimulus upon impact.

Areas of Application

Neurological Reflex Testing

The most common use of the percussion hammer is to test deep tendon reflexes (also known as muscle stretch reflexes). When the rubber head strikes a tendon, it triggers an involuntary muscle contraction. Commonly tested reflexes include:

Patellar reflex (knee-jerk reflex): Tapping the patellar tendon just below the kneecap causes extension of the lower leg.
Achilles reflex: Tapping the Achilles tendon causes plantarflexion of the foot.
Biceps reflex: Tapping the biceps tendon in the antecubital fossa causes flexion of the forearm.
Triceps reflex: Tapping the triceps tendon on the posterior upper arm causes extension of the forearm.

Percussion in a Broader Sense

In a broader medical context, percussion also refers to tapping body surfaces (e.g., the chest or abdomen) to assess underlying tissues based on the resulting sound. This technique typically uses the examiner's fingers rather than a hammer. The percussion hammer in the strict sense is primarily designated for reflex testing.

Types and Designs

Several models of percussion hammers exist, differing in shape, size, and intended use:

Taylor hammer: Triangular rubber head; widely used in general practice and neurology.
Babinski hammer: Round rubber head on a thin handle; frequently used in neurology.
Queen Square hammer: Round head on a long, flexible handle; particularly suited for testing the patellar reflex.
Troemner hammer: Compact design; often used in pediatrics.

Clinical Significance

Reflex testing with a percussion hammer provides valuable information about the condition of the nervous system. Altered reflexes can indicate various neurological disorders:

Diminished or absent reflexes (hyporeflexia / areflexia): Suggest peripheral nerve damage, such as in polyneuropathy or herniated discs.
Exaggerated reflexes (hyperreflexia): Suggest damage to the central nervous system (CNS), such as in multiple sclerosis, stroke, or spinal cord disease.
Pathological reflexes: Certain abnormal reflex responses (e.g., Babinski sign) indicate lesions of the upper motor neuron.

How the Examination is Performed

Reflex testing is performed with the patient in a relaxed position. The physician strikes the appropriate tendon with the percussion hammer and observes the reflex response. The intensity of the response is rated on a standardized scale (0 = no reflex, up to 4 = markedly hyperactive with clonus). Experience and practice are essential for accurate interpretation of the results.

References

Bickley, L. S. (2017). Bates' Guide to Physical Examination and History Taking (12th ed.). Wolters Kluwer.
Campbell, W. W. (2013). DeJong's The Neurologic Examination (7th ed.). Lippincott Williams & Wilkins.
World Health Organization (WHO). International Classification of Functioning, Disability and Health (ICF). Geneva: WHO Press.

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