Objective: Find correlations among vibratory parameter, electrodiagnostic study, and severity in carpal tunnel syndrome (CTS).

Material and Method: The hands of 87 patients were grouped according to severity, no CTS, mild, moderate, or severe CTS. Single-frequency (100 Hz) vibrometry and conventional nerve conduction studies (NCS) were tested. Vibratory parameters included threshold of digit 1 (VT1), threshold of digit 2 (VT2), threshold difference of digit 1-5 (VTD1-5) and threshold difference of digit 2-5 (VTD2-5). The correlations were found among the data; vibratory parameters obtained from ‘mild CTS’ and ‘no CTS’ groups were compared.

Results: All vibratory parameters were inversely correlated with sensory nerve action potential amplitude of median distribution at low level. VTD2-5 also correlated with median distal sensory latency, median-ulnar latencies difference, and median-radial latencies difference at low level. The correlations of disease severity and vibratory testing were between 0.422-0.617 (p < 0.001). There were no significant differences between vibratory parameters of ‘mild CTS’ and ‘no CTS’ groups.

Conclusion: Vibratory parameters have low level of correlation with NCS but low to moderate magnitude of correlation with severity of CTS.

Keywords: Vibrometry, Carpal tunnel syndrome, Nerve conduction study, severity