Benik's W Series Thumb Abduction and Opposition Supports are simple thumb sleeves with wrist straps that provide dynamic support to the thumb CMC and MP joints. Adson Test. The arm being tested is held in a dependent position while the head is rotated from side to side. The test is positive for thoracic outlet syndrome if there is an obliteration of the radial pulse. The Brisbane Hand & Upper Limb Research Institute was established in to facilitate and coordinate upper limb clinical and basic science research across the private and public health-care sectors in Brisbane, Queensland, Australia.