Carpal tunnel syndrome other diagnostic studies
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Carpal tunnel syndrome Microchapters |
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Carpal tunnel syndrome other diagnostic studies On the Web |
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Dheeraj Makkar, M.D.[2]
Overview
Primary prevention of CTS emphasizes ergonomic adaptations, healthy lifestyle practices, and management of systemic diseases. Early education and risk mitigation in high-exposure groups (e.g., office workers, manual laborers) are key to reducing incidence.
| Carpal tunnel diagnosis
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| Clinical | Numbness/tingling in radial 3½ digits
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Nocturnal paresthesias | Hand clumsiness/weakness | Thenar atrophy (advanced) First-line diagnosis based on history and physical exam
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| Provocative Tests | Phalen’s test: Wrist flexion reproduces symptoms | Tinel’s sign: Percussion elicits tingling | Durkan’s test: Direct compression; most sensitive Bedside screening maneuvers | |
| Electrodiagnostic (Gold Standard) | Prolonged distal motor latency | Slowed sensory conduction across tunnel | Reduced amplitude in severe cases | EMG: Denervation in thenar muscles Confirms diagnosis, quantifies severity |
| Imaging | Ultrasound: Median nerve CSA >9–10 mm², flattening, hypoechogenicity | MRI: Nerve swelling, T2 hyperintensity, flexor retinaculum bowing, secondary causes | X-ray/CT: Detects fractures, arthritis, deformities (not diagnostic) Adjunct in atypical, recurrent, or secondary CTS |