Study of interpolation method in diagnosis of carpal tunnel syndrome and comparison with midpalm antideromic sensory method.

Carpal tunnel syndrome (CTS) is the most common focal compression neuropathy. There are a significant number of different methods available to evaluate a patient for median nerve compromise at the carpal tunnel. One of them is interpolation method created by Dr E.B. Bodofski. In our study Sensitivity of interpolation method was 85.5%, Specificity was 85%, Positive predictive value was 94.6% and Negative predictive value was 65.4%. These results are lower than Dr Bodofski results. Also in our study sensitivity of midpalm antidromic sensory method was 95.1%, Specificity was 95%, Positive predictive value was 98.3% and Negative predictive value was 86.4%, these results are higher than results of interpolation method. These show interpolation method is a good method (with high sensitivity & specificity) for diagnosis of mild CTS, but it's sensitivity & specificity are lower than antideromic sensory stimulation method at wrist & midpalm.