Objective: In this study, we aim to determine the false-positive rate & specificity in normal subjects and carpal tunnel syndrome (CTS) patients of five provocative maneuvers used to diagnose thoracic outlet syndrome (TOS).
Design/methods: We prospectively evaluated subjects with clinical and electrophysiological evidence of CTS as well as normal subjects. All subjects underwent provocative testing by a blinded physician, which included the Adson A & B tests, Costoclavicular maneuver (CCM), Elevated arm stress test (Roos), and Supraclavicular pressure (SCP).
Results: In the CTS group, false positive tests were observed in 42% in the Adson A test, 45% in the Adson B test, 48% in the CCM, 77% in the Roos test, and 61% in the SCP 94% of the CTS patients had at least 1 positive TOS diagnostic maneuver. In the normal group, false positive tests were observed in 9% in the Adson A test, 20% in the Adson B test, 16% in the CCM, 47% in the Roos test, and 30% in the SCP 56% of the normal patients had at least 1 positive TOS diagnostic maneuver.
Conclusions: We conclude that current provocative maneuvers used to diagnose TOS result in a high false-positive rate in normal subjects and an even higher false-positive rate in CTS patients.