Carpal Tunnel Syndrome signs

Carpal tunnel syndrome has accumulated a dense vocabulary of eponymous and semi-eponymous clinical signs. The best-known are the Hoffmann–Tinel sign and Phalen manoeuvre, both provocative tests intended to reproduce paraesthesia in the median nerve distribution. Later tests, including Durkan’s carpal compression test, the pressure provocative test, and the Gilliatt–Wilson pneumatic tourniquet test, shifted the emphasis from percussion and wrist position toward mechanical provocation of median nerve compression.

The diagnostic emphasis has also moved away from isolated bedside signs. Katz and Stirrat’s hand diagram introduced structured symptom localisation; the flick sign captured a characteristic history feature; and the Boston / Levine questionnaire standardised patient-reported symptom severity and functional limitation. Sensory threshold tools such as the Semmes–Weinstein monofilament examination document sensory impairment but are not, by themselves, diagnostic of CTS.

Modern evidence supports a pattern-based approach. Individual signs such as Tinel, Phalen, tourniquet testing, and pressure provocation vary by technique, force, reference standard, and disease severity. They are best interpreted alongside symptom distribution, nocturnal symptoms, relief by shaking, thumb abduction weakness, sensory findings, hand diagrams, and structured tools such as the Wainner clinical prediction rule or CTS-6. AAOS 2024 guidance supports structured clinical diagnosis, with ultrasound or nerve conduction studies used selectively for uncertain cases, atypical presentations, severity assessment, or preoperative planning

History of CTS as a clinical entity

1854 – Sir James Paget (1814–1899) described two cases of median nerve compression at the wrist. The first followed constriction at the wrist by a tight cord and the second followed fracture of the distal radius with excessive new bone formation and compression of the median nerve. Paget did not define carpal tunnel syndrome but recognised the pathological effect of pressure on the median nerve at the wrist, and the clinical improvement when that pressure was relieved.

1880 – James Jackson Putnam (1846–1918) described recurrent nocturnal and early-morning paraesthesia, pain, numbness, and weakness of the hands. Patients suffering acroparesthesia undoubtedly had idiopathic carpal tunnel syndrome, but the relationship to median nerve compression at the wrist was not yet fully understood. Later known as Putnam’s Acroparesthesia.

1911–1914 – James Ramsay Hunt (1872–1937) described thenar and hypothenar neural atrophy, emphasising wasting of the small hand muscles. He attributed thenar wasting to compression or neuritis of the median thenar branch near the anterior annular ligament and separated this motor syndrome from the sensory acroparesthesia tradition.

1912–1913 – Pierre Marie (1853–1940) and Charles Foix (1882–1927) analysed isolated non-progressive atrophy of the small hand muscles. They reported a case of isolated thenar atrophy due to median nerve pathology at the anterior annular ligament of the carpus. They suggested that early division of the anterior annular ligament could prevent progression.

1947 – W. Russell Brain (1895–1966), A. Dickson Wright, and Marcia Wilkinson demonstrated that spontaneous median nerve compression in the carpal tunnel could produce both median-distribution sensory symptoms and partial thenar atrophy. They reported six surgically treated cases in which division of the transverse carpal ligament produced rapid relief of pain and tingling.

1950–1966 – George S. Phalen (1911–1998) popularised the modern clinical understanding of carpal tunnel syndrome through large clinical series. He clarified the anatomy, diagnosis, and treatment by corticosteroid injection or carpal tunnel release. His publications made CTS widely recognisable in clinical practice.

Provocative signs in carpal tunnel syndrome

These provocative signs all attempt to reproduce median nerve symptoms, but they do so by different mechanisms: percussion or tapping over the nerve, sustained wrist flexion, wrist extension, ischaemia, or direct carpal tunnel compression. Their diagnostic performance varies because technique, force, duration, reference standard, and disease severity differ across studies. They are best interpreted as adjunctive clinical findings rather than stand-alone diagnostic tests.

1915 – Hoffmann–Tinel sign
Paul Hoffmann (1884–1962) and Jules Tinel (1879–1952) independently described mechanically induced distal tingling in injured peripheral nerves during the First World War. Hoffmann emphasised light percussion over a regenerating nerve; Tinel described pressure over an injured nerve trunk producing distal formication. Its later use at the wrist represents adaptation of a nerve-regeneration sign to median nerve compression. In CTS, the test is positive when light tapping or percussion over the median nerve at the wrist reproduces radiating paraesthesia in the median nerve distribution.
Link out: Hoffmann–Tinel sign; Paul Hoffmann; Jules Tinel.

1948 / 1950 – Phalen sign / wrist-flexion test
George S. Phalen (1911–1998) introduced the wrist-flexion test in the late 1940s and helped popularise it through his subsequent CTS series. The classic manoeuvre asks the patient to allow both wrists to fall into complete flexion, usually for 30–60 seconds. Reproduction or worsening of median-distribution numbness or paraesthesia is positive. The commonly illustrated dorsum-to-dorsum version is a later modified Phalen variant, not Phalen’s original description.
Link out: Phalen test; George Phalen.

1950 / 1994 – Reverse Phalen test / Wormser test
Peter Wormser discussed wrist dorsiflexion as a provocative or pathogenetic factor in CTS in 1950. Later, the reverse Phalen manoeuvre was formalised as sustained wrist and finger extension, usually with the palms together in a “prayer” position. It provokes symptoms by wrist extension rather than flexion. Experimental pressure studies suggest wrist extension can increase carpal tunnel pressure substantially, but diagnostic performance remains modest and it is best treated as an adjunct, not a replacement for Phalen’s wrist-flexion test.
Link out: Phalen test / reverse Phalen; Wormser test.

1953 – Gilliatt–Wilson pneumatic tourniquet test
Roger W. Gilliatt and T. Grahame Wilson described a pneumatic-tourniquet test for CTS. A cuff was inflated around the arm above the elbow to arrest circulation; in affected patients, intense paraesthesia or early sensory loss appeared preferentially in the median nerve distribution. They found altered ischaemic paraesthesiae in 13/35 suspected cases, especially in patients with frequent severe nocturnal symptoms. The test supported the concept that acroparaesthesia could result from median nerve compression at the carpal tunnel, but it is now mainly of historical interest.
Link out: Gilliatt–Wilson tourniquet test.

1991 – Durkan test / carpal compression test
John A. Durkan introduced the carpal compression test, applying direct pressure over the carpal tunnel and underlying median nerve for up to 30 seconds. A positive test reproduces numbness, pain, or paraesthesia in the distal median nerve distribution. Durkan reported higher sensitivity and specificity than Phalen and Tinel in his original study. The later Durkan CTS gauge attempted to standardise the pressure applied during testing.
Link out: Durkan test; John Durkan.

1992 – Pressure provocative test
Tara M. Williams, Susan E. Mackinnon, Christine B. Novak, Steven McCabe, and Louise Kelly verified the pressure provocative test as a direct median nerve compression manoeuvre. Direct thumb pressure was applied over the median nerve at the wrist while a sphygmomanometer was used to standardise pressure at 100 or 150 mmHg. In their study of 30 CTS patients and 30 controls, the high-pressure test had sensitivity 100%, specificity 97%, and a mean symptom onset time of 9 seconds, faster than Phalen’s test at 30 seconds.
Link out: Durkan test / pressure provocative test.

Symptom localisation and history tools

These tools differ from provocative signs because they do not attempt to mechanically reproduce median nerve symptoms. Instead, they capture where symptoms occur, how patients relieve them, and how severely CTS affects daily function. Katz hand diagrams and the flick sign support clinical diagnosis by improving pattern recognition, while the Boston / Levine questionnaire is primarily a severity and outcome instrument rather than a stand-alone diagnostic test.

1984 – Flick sign
W. E. Pryse-Phillips described and validated the flick sign as a history feature in carpal tunnel syndrome. The sign is positive when the patient reports or demonstrates shaking/flicking the hand to relieve nocturnal or activity-related paraesthesia, “like shaking down a thermometer.” Pryse-Phillips reported that the flick sign predicted electrodiagnostic abnormality in 93% of cases, with a false-positive rate under 5% among other neural lesions of the arm. Later studies did not reproduce such strong performance consistently, so it is best treated as a useful history clue rather than a definitive diagnostic sign.
Link out: Flick sign; clinical signs in CTS. 1990 – Katz / Katz–Stirrat hand diagram
Jeffrey N. Katz and C. R. Stirrat developed a self-administered hand diagram to improve symptom localisation in patients with upper-limb paraesthesia. Patients mark the distribution of pain, numbness, tingling, or altered sensation on palmar and dorsal hand diagrams; patterns are then classified as classic, probable, possible, or unlikely CTS. A later 1990 Katz study reported that a classic or probable diagram had sensitivity 0.64, specificity 0.73, and positive predictive value 0.58 against nerve conduction diagnosis. The hand diagram is useful because it shifts assessment from eponymous bedside signs toward structured symptom mapping.
Link out: Katz hand diagram; Katz–Stirrat hand diagram. 1993 – Boston Carpal Tunnel Questionnaire / Levine questionnaire
David W. Levine, Barry P. Simmons, Michael J. Koris, Lisa H. Daltroy, George G. Hohl, Allen H. Fossel, and Jeffrey N. Katz developed a self-administered questionnaire to assess symptom severity and functional status in CTS. The instrument became known as the Boston Carpal Tunnel Questionnaire (BCTQ) or Levine questionnaire, with two main components: the Symptom Severity Scale and the Functional Status Scale. It is best presented as a patient-reported severity and outcome measure rather than a diagnostic sign, although it is often used in CTS research, treatment trials, and postoperative follow-up.
Link out: Boston Carpal Tunnel Questionnaire; Levine questionnaire.

Sensory and motor assessment

These sensory and motor tests differ from provocative signs because they do not attempt to reproduce paraesthesia. Instead, they document sensory threshold, tactile discrimination, functional sensibility, and thenar motor performance. They are most useful for grading severity, documenting impairment, tracking recovery, or supporting the clinical pattern of median nerve dysfunction. In isolation, none reliably diagnoses CTS.

1952 / 1960 – Semmes–Weinstein monofilament examination
Josephine Semmes (1916–1998) and Sidney Weinstein (1922–2010) developed calibrated nylon monofilaments to quantify cutaneous pressure threshold, first for neuropsychological studies of somatosensory loss after penetrating brain injury. The method later became widely used in peripheral nerve assessment, including Hansen disease, diabetic neuropathy, hand sensibility testing, and entrapment neuropathies. In CTS, Semmes–Weinstein testing documents altered sensory threshold in the median nerve distribution, but it is not a provocative diagnostic sign.
Link out: Semmes–Weinstein monofilament examination; Josephine Semmes; Sidney Weinstein.

1958 – Moberg pick-up test
Erik Moberg (1905–1993) published Objective methods for determining the functional value of sensibility in the hand. The Moberg pick-up test assesses functional sensibility by timing how quickly a patient picks up small objects, usually with vision and then without vision. It is relevant to CTS because median nerve sensory loss may impair tactile gnosis, object manipulation, and fine hand function, but it is an outcome / functional sensibility test rather than a primary diagnostic sign.
Link out: Moberg pick-up test; Erik Moberg.

Two-point discrimination
Static two-point discrimination tests the minimum distance at which two points applied to the fingertip are perceived as separate. In CTS it is used to document sensory impairment, especially in more advanced median nerve dysfunction. However, it is relatively insensitive for early CTS and technique-dependent; modern reviews caution against using it as a sole diagnostic measure. Buch-Jaeger and Foucher used >6 mm at the index pulp as abnormal in their CTS clinical-sign study, but found low sensitivity.
Link out: Two-point discrimination; sensory assessment in CTS.

Vibration testing / vibrometry
Vibration assessment ranges from bedside tuning-fork comparison to quantitative vibrometry. In CTS it assesses large-fibre sensory dysfunction and can document impaired median nerve function. Szabo et al. evaluated vibrometry, 256-Hz vibration, Semmes–Weinstein monofilaments, and two-point discrimination in CTS, distinguishing threshold tests from innervation-density testing. More recent work using multi-frequency vibrometry found increased vibration perception thresholds across multiple frequencies in CTS patients compared with controls.
Link out: Vibration testing; vibrometry in CTS.

Thumb abduction strength
Weakness of thumb abduction reflects dysfunction of the abductor pollicis brevis, supplied by the recurrent motor branch of the median nerve. It is more likely in moderate to severe or longstanding CTS than in early disease. D’Arcy and McGee found thumb abduction strength testing more useful than many traditional provocative signs in distinguishing electrodiagnostically confirmed CTS, although normal strength does not exclude CTS.
Link out: Thumb abduction testing; CTS-6.

1986 – Kapandji opposition score
Adalbert I. Kapandji (1928–2019) described a clinical test of thumb apposition and opposition. The Kapandji opposition score grades how far the thumb can reach across the fingers and palm, from poor opposition to contact with the distal palmar crease. In CTS it is relevant as a functional assessment of thenar motor impairment and postoperative recovery, but it is not specific for CTS and should not be treated as a diagnostic test.
Link out: Kapandji opposition score; Adalbert Kapandji.

Functional outcome measures

Functional outcome measures assess what CTS does to hand performance and daily life, rather than whether a provocative sign reproduces paraesthesia. Grip dynamometry quantifies power; the Moberg pick-up test assesses functional sensibility and dexterity; and the Boston / Levine questionnaire captures patient-reported symptoms and functional limitation. These measures are most useful for baseline severity, treatment response, research comparison, and postoperative follow-up, not as stand-alone diagnostic tests.

1954 – Jamar dynamometer / grip-strength testing
Charles O. Bechtol described grip testing with a dynamometer with adjustable handle spacing in 1954, providing a reproducible way to quantify hand grip strength. The later Jamar hydraulic dynamometer became the standard clinical instrument for measuring grip strength. In CTS, grip strength is useful for documenting functional impairment and recovery after treatment, but it is not a diagnostic test for CTS.
Link out: Jamar dynamometer; grip strength; hand function.

1958 – Moberg pick-up test
Erik Moberg (1905–1993) introduced objective methods for assessing the functional value of sensibility in the hand. The Moberg pick-up test times how quickly a patient can pick up small objects, usually with vision and then without vision. It is useful in median nerve dysfunction because CTS can impair tactile gnosis, dexterity, and object manipulation. It overlaps with sensory assessment, but on this page it probably fits best as a functional sensibility outcome measure.
Link out: Moberg pick-up test; Erik Moberg; functional sensibility.

1993 – Boston Carpal Tunnel Questionnaire / Levine questionnaire
David W. Levine, Barry P. Simmons, Michael J. Koris, Lisa H. Daltroy, George G. Hohl, Allen H. Fossel, and Jeffrey N. Katz developed a self-administered CTS questionnaire to measure symptom severity and functional status. The Boston Carpal Tunnel Questionnaire (BCTQ), also known as the Levine questionnaire, contains two scales: the Symptom Severity Scale and the Functional Status Scale. It is one of the most widely used patient-reported outcome measures in CTS research and follow-up, especially after splinting, steroid injection, or carpal tunnel release.
Link out: Boston Carpal Tunnel Questionnaire; Levine questionnaire; Jeffrey Katz.

Prediction rules / modern synthesis

Prediction rules mark the shift from isolated eponymous signs toward structured clinical diagnosis. The Wainner rule combines history, symptom severity, wrist shape, sensory findings, and age; CTS-6 combines key symptoms and physical findings into a weighted score. Both approaches recognise that CTS is best diagnosed by a pattern of findings, not by a single positive Tinel, Phalen, or compression test.

2005 – Wainner clinical prediction rule
Robert S. Wainner and colleagues developed a five-item clinical prediction rule for CTS, combining history, anthropometry, patient-reported severity, sensory testing, and age. The five items were: shaking the hand for symptom relief; wrist-ratio index >0.67; Symptom Severity Scale score >1.9; reduced median sensory field of the thumb; and age >45 years. When all five items were positive, the likelihood ratio was 18.3; when four were positive, the likelihood ratio was 4.6. This rule is useful historically because it combines older observations — especially the flick/shaking sign and wrist ratio — into a structured diagnostic cluster.
Link out: Wainner clinical prediction rule; Flick sign; Square wrist ratio; Boston / Levine questionnaire.

2006 / 2008 – CTS-6 diagnostic tool
Brent Graham and colleagues developed and validated weighted clinical diagnostic criteria for CTS, later used as the CTS-6. The tool combines six clinical features: numbness predominantly in the median nerve distribution; nocturnal numbness; thenar weakness or atrophy; positive Phalen test; positive Tinel sign; and loss of two-point discrimination. It gives a weighted score rather than relying on any one sign alone.
Link out: CTS-6; Phalen test; Hoffmann–Tinel sign; thumb abduction testing; two-point discrimination.

2024 – AAOS clinical practice guideline
The American Academy of Orthopaedic Surgeons updated its Management of Carpal Tunnel Syndrome clinical practice guideline in 2024. The guideline supports use of CTS-6 as a diagnostic tool and places structured clinical assessment ahead of routine ultrasound or electrodiagnostic testing in typical adult CTS presentations. Ultrasound or nerve conduction studies remain useful when diagnosis is uncertain, presentation is atypical, severity grading is needed, or preoperative clarification is required.
Link out: CTS-6; carpal tunnel syndrome diagnosis; nerve conduction studies.

Category	Tests / tools
Provocative nerve symptoms	Hoffmann–Tinel, Phalen, reverse Phalen, Durkan, pressure provocative test, Gilliatt–Wilson tourniquet
Symptom localisation	Katz hand diagram
History clue	Flick sign
Sensory threshold / impairment	Semmes–Weinstein monofilaments, two-point discrimination, vibration
Anthropometric predictor	Square wrist ratio / wrist ratio index
Patient-reported severity	Boston / Levine questionnaire
Prediction tools	Wainner CPR, CTS-6

History of Carpal tunnel

1853 – Sir James Paget provided an early description of median nerve compression at the wrist. In Lectures on Surgical Pathology. He described two cases of median nerve injury. The first followed constriction at the wrist by a tight cord and the second followed fracture of the distal radius with excessive new bone formation and compression of the median nerve. Paget recognised the pathological effect of pressure on the median nerve at the wrist, and the clinical improvement when that pressure was relieved

Clinical signs

Related tests

Clinical prediction rule

Term	Category	Historical anchor	Modern interpretation
Hoffmann-Tinel sign	True eponymous sign	Paul Hoffmann and Jules Tinel independently described the percussion-induced “tingling” phenomenon in 1915, originally in the context of peripheral nerve injury/regeneration rather than CTS. (PMC)	Useful historically and clinically, weak if treated as a stand-alone CTS diagnostic test. Adaptation of a nerve-injury sign to compression neuropathy.
Phalen sign / Phalen manoeuvre	True eponymous CTS provocative sign	Phalen’s 1950 paper is foundational for modern CTS, but the wrist-flexion manoeuvre is better tied to later Phalen descriptions, particularly 1957 and subsequent series. The 1957 JAMA paper described diagnosis based on median-distribution symptoms, exacerbation with wrist flexion, and tingling with percussion over the carpal tunnel. (PubMed)	Still widely used, but should be presented as a probability-increasing manoeuvre, not a diagnostic rule.
Durkan carpal compression test	Named provocative test	Durkan’s 1991 paper introduced a direct pressure test over the carpal tunnel and median nerve, reporting greater sensitivity and specificity than Tinel and Phalen in that study. (PubMed)	Clinically useful, but overlaps conceptually with “pressure provocative” testing. I’d keep Durkan as the named clinical term and discuss pressure provocation beneath it.
Pressure provocative test	Descriptive / semi-named test	Williams, Mackinnon, Novak, McCabe and Kelly verified a pressure provocative test in 1992; in their small study it had high sensitivity and faster symptom reproduction than Phalen. (PubMed)	This should not sit as a separate major eponym unless you want a “related tests” subsection. It is more a family of median nerve compression provocation tests.
Katz / Katz-Stirrat hand diagram	Named patient-reported diagnostic aid	Katz and Stirrat published self-administered hand diagrams in 1990, classifying symptom drawings as classic, probable, possible or unlikely CTS. A classic/probable diagram had sensitivity 0.64 and specificity 0.73 against nerve conduction diagnosis in one 1990 study. (PubMed)	Probably one of the more useful historical-to-modern bridges: from named “sign” to structured symptom localisation.
Flick sign	Descriptive history sign, not true eponym	Pryse-Phillips validated the “flick sign” in 1984, describing symptom relief by shaking/flicking the hand; the original study reported high diagnostic performance, but later work did not reproduce such strong results. (PMC)	Worth including, but I’d explicitly call it a history feature, not a physical sign.
Square wrist ratio / wrist ratio index	Anthropometric risk/probability marker	Radecki’s 1994 paper linked wrist ratio with likelihood of median nerve abnormality at the carpal tunnel. (PubMed)	Not an eponym and not really a “sign” in the same way. Better placed under anthropometric predictors or clinical prediction rules.
Wainner clinical prediction rule	Named clinical prediction rule	Wainner et al. combined shaking the hand for relief, wrist-ratio index >0.67, symptom severity score >1.9, reduced thumb sensation and age >45; all five positive findings gave LR 18.3 in the derivation study. (archives-pmr.org)	Useful as the modern synthesis of several older observations, including flick sign and wrist ratio.
CTS-6	Modern structured clinical tool	AAOS 2024 supports CTS-6 as a diagnostic tool in place of routine ultrasound or NCV/EMG in appropriate patients.	Not an eponym, but essential for the “how this changed over time” section.

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Clinical Signs

Gilliatt-Wilson pneumatic tourniquet test

Boston Carpal Tunnel Questionnaire / Levine questionnaire

Hoffmann-Tinel sign (1915)

Phalen sign (1950)

Katz Hand diagram (1990)

Pressure Provocation test

Square Wrist Ratio (https://pubmed.ncbi.nlm.nih.gov/8198771/)

Flick sign

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Associated Persons

• Sir James Paget (1814-1899)
• James Jackson Putnam (1846–1918)
• Charles Foix (1882–1927)
• Pierre Marie (1853–1940)
• Paul Hoffmann (1884-1962) and the Hoffmann-Tinel test
• Jules Tinel (1879-1952) and the Hoffmann-Tinel test
• George S. Phalen (1911-1998) and the Phalen test
• John A Durkan and th Durkan test
• Jeffrey N Katz

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Alternative names

• Name
• Name

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References

Test / tool	Original or anchor reference	Notes for the article
Gilliatt–Wilson pneumatic tourniquet test	Gilliatt RW, Wilson TG. A pneumatic-tourniquet test in the carpal-tunnel syndrome. Lancet. 1953;265:595–597.	Inflated brachial cuff, originally suprasystolic, looking for dysaesthesiae. Later work compared suprasystolic with infrasystolic methods. (PubMed)
Boston Carpal Tunnel Questionnaire / Levine questionnaire	Levine DW, Simmons BP, Koris MJ, Daltroy LH, Hohl GG, Fossel AH, Katz JN. A self-administered questionnaire for the assessment of severity of symptoms and functional status in carpal tunnel syndrome. JBJS Am. 1993;75:1585–1592.	Better framed as an outcome/severity measure, not a diagnostic provocative test. Two scales: symptom severity and functional status; reproducible, internally consistent, and responsive to clinical change. (PubMed)
Hoffmann–Tinel sign	Hoffmann 1915; Tinel 1915; Buck-Gramcko & Lubahn 1993 for English translation / historical argument.	Keep as “historical nerve-regeneration sign later adapted to CTS.” Modern CTS “Tinel” is usually tapping over the median nerve, closer to Hoffmann’s light percussion than Tinel’s original pressure description.
Phalen sign	Phalen GS, Gardner WJ, La Londe AA. Neuropathy of the median nerve due to compression beneath the transverse carpal ligament. JBJS Am. 1950;32A:109–112. Later clarified/illustrated in Phalen 1966.	For the overview, say Phalen’s 1950 work was foundational, but the classic wrist-flexion test is better documented in later Phalen descriptions, especially 1966. (PubMed)
Katz / Katz–Stirrat hand diagram	Katz JN, Stirrat CR. A self-administered hand diagram for the diagnosis of carpal tunnel syndrome. J Hand Surg Am. 1990;15:360–363.	Classifies diagrams as classic, probable, possible, or unlikely CTS. Original study: classic/probable sensitivity 80%, specificity 90% against independent objective clinical criteria. (PubMed)
Pressure provocative test	Williams TM, Mackinnon SE, Novak CB, McCabe S, Kelly L. Verification of the pressure provocative test in carpal tunnel syndrome. Ann Plast Surg. 1992;29:8–11.	Direct pressure over the carpal tunnel. In 30 CTS patients and 30 controls, pressure provocative test sensitivity 100%, faster symptom reproduction than Phalen; compare with Durkan but don’t merge them. (PubMed)
Square wrist ratio / wrist ratio index	Radecki P. A gender specific wrist ratio and the likelihood of a median nerve abnormality at the carpal tunnel. Am J Phys Med Rehabil. 1994;73:157–162.	Anthropometric risk/probability marker, not a provocative sign. Wrist ratio ≥0.7 associated with median nerve abnormality in 79% of women and 86.9% of men in Radecki’s cohort. (PubMed)
Flick sign	Pryse-Phillips WE. Validation of a diagnostic sign in carpal tunnel syndrome. J Neurol Neurosurg Psychiatry. 1984;47:870–872.	History sign: patient shakes/flicks the hand for symptom relief. Original report was very optimistic: positive flick sign predicted electrodiagnostic abnormality in 93% with false-positive rate under 5%; later studies did not reproduce such strong performance. (PMC)
Wainner clinical prediction rule	Wainner RS et al. Development of a clinical prediction rule for the diagnosis of carpal tunnel syndrome. Arch Phys Med Rehabil. 2005;86:609–618.	Combines flick/shaking relief, wrist ratio >0.67, Symptom Severity Scale >1.9, reduced thumb sensory field, and age >45. LR 18.3 when all five positive. (PubMed)
CTS-6	Graham B. The value added by electrodiagnostic testing in the diagnosis of carpal tunnel syndrome. JBJS Am. 2008;90:2587–2593.	Modern structured diagnostic tool. AAOS 2024 guideline cites Graham 2008 and supports structured diagnostic assessment rather than routine electrodiagnosis for every typical case.

Historical

• Putnam JJ. A series of cases of paresthesia, mainly of the hands, of periodical recurrence, and possibly of vaso-motor origin. Archives of Medicine (New York). 1880; 4: 147–162.
• Hunt, J.R. The thenar and hypothenar types of neural atrophy of the hand. Am J Med Sci. 1911; 141:224-241
• Hoffmann P. Über eine Methode, den Erfolg einer Nervennaht zu beurteilen. [Using a method to assess the success of a nerve attack] Medizinische Klinik, 1915; 11: 359-360
• Hoffmann P. Weiteres über das Verhalten frisch regenerierter Nerven und über eine Methode, den Erfolg einer Nervennaht frühzeitig zu beurteilen. Medizinische Klinik. 1915; 11: 856-858.
• Tinel J. Le signe du ‘fourmillement’ dans les lésions des nerfs périphériques. La Presse Médicale. 1915; 47: 388–389. [English translation: Kaplan EB The “tingling” sign in peripheral nerve lesions. 1972 [PDF]]
• Brain WR, Wright AD, Wilkinson M. Spontaneous compression of both median nerves in the carpal tunnel; six cases treated surgically. Lancet. 1947 Mar 8;1(6443-6445):277-82. 
• Gilliatt RW, Wilson TG. A pneumatic-tourniquet test in the carpal-tunnel syndrome. Lancet. 1953 Sep 19;265(6786):595-7. 
• Phalen GS. The carpal-tunnel syndrome. Seventeen years’ experience in diagnosis and treatment of six hundred fifty-four hands. J Bone Joint Surg Am. 1966;48(2):211-228.
• Pryse-Phillips WE. Validation of a diagnostic sign in carpal tunnel syndrome. J Neurol Neurosurg Psychiatry. 1984 Aug;47(8):870-2
• Katz JN, Stirrat CR. A self-administered hand diagram for the diagnosis of carpal tunnel syndrome. J Hand Surg Am. 1990 Mar;15(2):360-3
• Durkan JA. A new diagnostic test for carpal tunnel syndrome. J Bone Joint Surg Am. 1991 Apr;73(4):535-8. Erratum in: J Bone Joint Surg Am 1992 Feb;74(2):311.
• Williams TM, Mackinnon SE, Novak CB, McCabe S, Kelly L. Verification of the pressure provocative test in carpal tunnel syndrome. Ann Plast Surg. 1992 Jul;29(1):8-11.
• Levine DW, Simmons BP, Koris MJ, Daltroy LH, Hohl GG, Fossel AH, Katz JN. A self-administered questionnaire for the assessment of severity of symptoms and functional status in carpal tunnel syndrome. J Bone Joint Surg Am. 1993 Nov;75(11):1585-92
• Radecki P. A gender specific wrist ratio and the likelihood of a median nerve abnormality at the carpal tunnel. Am J Phys Med Rehabil. 1994 Jun;73(3):157-62.
• Wainner RS, Fritz JM, Irrgang JJ, Delitto A, Allison S, Boninger ML. Development of a clinical prediction rule for the diagnosis of carpal tunnel syndrome. Arch Phys Med Rehabil. 2005 Apr;86(4):609-18.
• Graham B. The value added by electrodiagnostic testing in the diagnosis of carpal tunnel syndrome. J Bone Joint Surg Am. 2008 Dec;90(12):2587-93.

Reviews

• Buch-Jaeger N, Foucher G. Correlation of clinical signs with nerve conduction tests in the diagnosis of carpal tunnel syndrome. J Hand Surg Br. 1994 Dec;19(6):720-4
• Paget J. The first description of carpal tunnel syndrome. J Hand Surg Eur Vol. 2007 Apr;32(2):195-7.
• Westerman D, Kerkhoff H, Visser GH, Kleyweg RP. Interobserver agreement in case history evaluation in carpal tunnel syndrome. J Clin Neuromuscul Dis. 2012 Jun;13(4):196-200
• McGee S. Evidence-Based Physical Diagnosis. 4e. 2017: 1196
• Genova A, Dix O, Saefan A, Thakur M, Hassan A. Carpal Tunnel Syndrome: A Review of Literature. Cureus. 2020 Mar 19;12(3):e7333.