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What is a trigger finger and what causes it? 1. Historicopous, trigger fingers, or trigger digit (also a sub-set of stenosing tenosynovitis) is a common disorder characterized by catching, snapping or locking of the involved finger flexor tendon, associated with dysfunction and pain. 2.A disparity in size between the flexor tendon and the surrounding retinacular pulley system, most commonly at the level of the first annular pulley, results in difficulty flexing or extending the finger and the "triggering" phenomenon. The label of trigger finger is used because when the finger unlocks, it pops back suddenly, as if releasing a trigger on a gun. How to deal with trigger finger?♥Finger Splint has a high success rate to reduce the need for injections and surgeries. Our Genmine Finger Splint is built In Aluminum Support can provide strong support for your fingers. Moreover, it is breathable and lightweight; you can wear it day and night. Specifications: ♥Materials: Composite Cloth, Aluminum. Package Included: 1X Trigger Finger Splint.