This condition is related to tendonitis of the abductor pollucis longus (APL) and extensor pollucis brevis (EPB). These tendons are located over the radial aspect of the wrist and control function of the thumb. These tendons pass through a fibro-osseous tunnel where they can become entrapped, damaged and chronically inflamed. This is typically encountered as an overuse injury. Initial treatment is oral anti-inflammatory medications, steroid injections, bracing, activity avoidance and exercises. In cases that do not resolve with medical treatment surgery is recommended.