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trigger finger
Trigger finger, trigger thumb, 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. A disparity in size between the flexor tendon and the surrounding retinacular pulley system, most commonly at the level of the first annular (A1) 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.
==Causes==
The cause of trigger finger is unclear but several causes have been proposed.〔 It has also been called stenosing tenosynovitis (specifically ''digital tenovaginitis stenosans''), but this may be a misnomer, as inflammation is not a predominant feature.
It has been speculated that repetitive forceful use of a digit leads to narrowing of the fibrous digital sheath in which it runs, but there is little scientific data to support this theory. The relationship of trigger finger to work activities is debatable and scientific evidence for and against hand use as a cause exist. While the mechanism is unclear, there is some evidence that triggering of the thumb is more likely to occur following surgery for carpal tunnel syndrome. it may also occur in rheumatoid arthritis
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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