Flick Sign

Abstract

The Flick Sign, sometimes referred to as the “Waving Hands Sign,” is a simple, highly specific clinical test used primarily in the diagnosis of Carpal Tunnel Syndrome (CTS). This observational sign is elicited during a patient interview, focusing on the patient’s coping mechanisms for nocturnal or severe discomfort in the hands. The test is considered positive if the patient reports instinctively performing a rapid, flicking or shaking motion of the hands to alleviate pain or paresthesia. Developed by Pryse-Phillips in 1984, this sign assesses symptoms related to Peripheral Nervous System dysfunction, specifically affecting the upper extremity and associated sensory functions.

Keywords

Flick Sign, Waving Hands Sign, Carpal Tunnel Syndrome (CTS), Pryse-Phillips, Nocturnal pain, Paresthesia, Median nerve, Upper extremity, Peripheral Nervous System, Clinical observation.

Authors

Pryse-Phillips WE (1984)

Purpose

The primary purpose of the Flick Sign is to serve as a fast and non-invasive clinical screening tool for the presence of Carpal Tunnel Syndrome (CTS). It helps clinicians rapidly identify patients who are likely suffering from median nerve compression, especially when symptoms are most debilitating, such as during the night.

As an observational measure, it relies entirely on the patient’s self-reported, spontaneous action taken to relieve symptoms. Its ease of administration makes it valuable in general practice and initial neurological assessments focusing on the upper extremity and related sensory functions and pain perception.

Construct

The Flick Sign measures a specific behavioral response indicative of median nerve irritation or compression within the carpal tunnel. The underlying construct is the spontaneous, involuntary motor action (flicking, shaking, or wringing of the hands) used by individuals with CTS to temporarily improve blood flow or nerve conduction, thereby relieving severe discomfort, numbness, or tingling (paresthesia).

This sign is intrinsically linked to the pathophysiology of nerve entrapment, where changes in wrist posture (often occurring during sleep) increase pressure on the median nerve. The positive response signifies a highly characteristic symptom management strategy adopted by patients experiencing significant neurological distress in the hands and wrists.

Validity

While the Flick Sign is a behavioral observation rather than a complex psychometric instrument, its validity is assessed clinically, generally demonstrating high specificity for Carpal Tunnel Syndrome. Studies comparing the Flick Sign to electrophysiological testing (Nerve Conduction Studies) often report moderate to high sensitivity and high specificity, making it an excellent rule-in test.

Its diagnostic utility suggests strong concurrent validity when used alongside other established physical examination maneuvers (such as Tinel’s Sign or Phalen’s Test). The sign’s ecological validity is high, as it assesses a real-world, spontaneous behavior exhibited by the patient in response to chronic symptoms.

Reliability

The reliability of the Flick Sign hinges on the clarity of the patient’s self-report and the standardized phrasing of the eliciting question. Inter-rater reliability is generally high because the interpretation of the sign (positive or negative) is straightforward—the patient either reports the flicking action or they do not.

Test-retest reliability is also considered robust, as the underlying symptom pattern (nocturnal exacerbation of CTS symptoms) tends to be chronic and consistent. However, reliability may decrease if the condition is mild or intermittent, or if the patient fails to accurately describe the specific “flicking” motion required for a positive result.

Factor Analysis

As the Flick Sign consists of a single, dichotomous (Yes/No) observation, formal psychometric factor analysis is not applicable. It does not measure latent traits through multiple correlated items. Instead, it functions as a singular diagnostic indicator within a broader clinical assessment battery. Its value is derived from its strong correlation with the presence of median nerve compression, serving as a powerful clinical factor in the overall diagnostic picture of CTS.

Instrument

Test Type: Observation/Clinical Sign

Format: Interview-based clinical elicitation

Language Available: Originally described in English; easily adaptable to any language due to its simple, descriptive nature.

Population Group: Adults, Elderly

Age Group: Adult population (18+)

Population Details: Individuals presenting with symptoms suggestive of peripheral neuropathy, particularly pain, tingling, or numbness in the hands and wrists. The associated conditions include disorders of the Peripheral Nervous System and sensory organs.

Test Methodology: The methodology involves a direct, targeted question regarding specific coping behaviors used to manage severe, often nocturnal, hand discomfort. This falls under the domain of clinical history taking focused on sensory functions and pain management in the upper extremity.

The original PDF documents related to this instrument are available here:

• The original Explanation Form (Toelichtingsformulier) can be downloaded here: https://scales.arabpsychology.com/wp-content/uploads/instrumenten/144_1_N.pdf
• The original Measurement Instrument (Meetinstrument) can be downloaded here: https://scales.arabpsychology.com/wp-content/uploads/instrumenten/144_3_N.pdf

Keywords

Diagnostic sign, Neurological assessment, Upper extremity, Median nerve entrapment, Clinical history, Pain assessment, Peripheral neuropathy, Observation method.

Authors

Author ORCID Identifier: Not provided in source content.

Affiliation Email addresses: Not provided in source content.

Correspondence Address: Not provided in source content.

Permissions & Fee and Test Year

The Flick Sign is a widely recognized clinical finding first documented in 1984 by Pryse-Phillips. As a standard clinical maneuver, it is generally considered to be in the public domain for clinical and research application, requiring no specific permissions or associated fees for its utilization in medical practice.

Reference’s

• Pryse-Phillips WE. (1984). The flick sign in the diagnosis of carpal tunnel syndrome. The Lancet, 2(8408), 911-912.
• Further clinical validation and detailed methodology are often referenced in subsequent neurological and orthopedic textbooks and literature.

Items of the Flick Sign

IMPORTANT: The following scale items must be preserved in their original language and must not be changed in any way.

Het “Flick sign” wordt ook wel het wapperende handen teken genoemd. De patiënt wordt gevraagd wat hij doet als hij (vooral ’s nachts) veel last heeft. Als de patiënt antwoordt: “wapperen met de handen”, is de test positief.