[With respect to Tinel and Phalen's signs]

Area of Science:

• Neurology
• Clinical Diagnostics
• Nerve Conduction Studies

Context:

• Carpal Tunnel syndrome (CTS) diagnosis relies on clinical tests like Phalen's and Tinel's signs.
• The diagnostic accuracy and correlation of these signs with electrophysiological findings are variably reported in literature.
• A comprehensive analysis was needed to validate these bedside tests against objective electrodiagnostic measures.

Purpose:

• To determine the correlation between Phalen's test and Tinel's sign with clinical presentation and electrodiagnostic parameters in Carpal Tunnel syndrome.
• To evaluate the diagnostic value of Tinel's sign in relation to motor and sensory nerve conduction velocities and distal latencies.
• To assess the relationship between Phalen's test results and electrophysiological evidence of median nerve compression.

Summary:

• In a study of 288 hands, Tinel's sign showed a significant correlation with electrodiagnostic findings (p < 0.05), particularly with increased distal motor and sensory latency (>4.5 ms).
• Phalen's test did not demonstrate a significant correlation with any electrophysiological parameters.
• Despite lacking electrodiagnostic correlation, Phalen's test identified typical Carpal Tunnel syndrome in 97% of positive cases, while Tinel's sign identified typical cases in 85%.

Impact:

• This research clarifies the diagnostic utility of Tinel's sign, highlighting its correlation with objective nerve conduction abnormalities in Carpal Tunnel syndrome.
• The findings suggest that while Phalen's test is highly sensitive for typical CTS presentations, Tinel's sign offers better correlation with the severity of median nerve compromise as indicated by electrodiagnostics.
• Provides clinicians with evidence-based insights for selecting and interpreting diagnostic tests for Carpal Tunnel syndrome, potentially improving diagnostic accuracy and patient management.