Trigger finger 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.
A nodule or inflammation and thickening on the flexor tendon may cause irregular movement of the finger. The finger feels locked in the bent position and when it is straightened, there is a painful snap. Repetitive activities aggravate this condition and pain starts limiting function. Splints may be used to limit bending of the finger for several weeks to allow the inflammation to diminish. This can be a reoccurring problem with inflammatory diseases such as rheumatoid arthritis.
Cause Of Trigger Finger
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.
Silver Ring Splints Trigger Finger Design
Design silver ring splints for tenosynovitis in the fingers. Use the SIRIS ™ Realignment or SIRIS ™ Boutonniere Splint to restrict flexion of the PIP joint when the flexor tendon tenosynovitis occurs in the proximal or middle phalanx. For tenosynovitis in the thumb. Use the SIRIS ™ Spiral Splint to block flexion of the IP joint of the thumb. Wear the splint with the center crossing diagonally over the dorsal surface of the IP joint. This is a very comfortable way to restrict flexion of the IP joint and limit irritation of the flexor tendons. For tenosynovitis in the palm. Use the SIRIS ™ Trigger Splint to relieve chronic recurring flexor tenosynovitis in the palm by restricting MCP flexion.