Trigger finger causes are not always readily apparent.
Although trigger finger causes are not always apparent, once the tendon in your finger starts getting stuck, the condition usually gets progressively worse.
This can happen in one of three ways:
The constant irritation or friction from the tendon getting stuck can cause the tendon to swell, making it harder for it to fit into the sheath. The sheath is lined with a slick coating called tenosynovium. The irritation from the tendon can cause the lining to become inflamed (swollen), making the sheath narrower. The irritation from the tendon can cause a nodule (a small growth or lump of tissue) to form in the sheath, partially blocking it.
As the cycle of irritation and inflammation repeats itself, the tendon eventually gets stuck and, the finger becomes locked in a bent position. Sometimes, the tendon will pop free and, your finger will be able to move again, but it may become stuck in a permanently bent position.
The cause of these problems is not fully understood and, in most cases, is never known. However, there are some factors that may cause trigger finger more likely.
In many cases trigger finger causes may be the result of repeated strain of this area due to work or hobby activities. Many other hand and upper extremity problems and repetitive motion disorders have been associated with trigger finger.
Tasks that require repetitive grasping or the prolonged use of tools (scissors, screwdrivers, etc) which press firmly on the tendon sheath at the base of the finger or thumb may irritate the tendons and result in thickening of the tendons themselves or the tendon sheath. Someone may be more prone to the development of a trigger finger if they routinely grip an item such as a power tool or musical instrument for extended periods of time.
Factors of trigger finger causes include:
Some trigger finger causes are associated with medical conditions such as rheumatoid arthritis, gout and diabetes.
Local trauma to the palm/base of the finger, repeated trauma from pistol- griped power tools, or long hours grasping a steering wheel can cause triggering. Infection to the synovium causes a rounded swelling (nodule) to form in the tendon which may be a factor on occasion, but in most cases there is not a clear cause. Triggering can also be caused by a congenital defect that forms a nodule on the tendon. The condition is not usually noticeable until infants begin the use their hands. Trigger Finger may also be caused by an infection of the synovium, resulting in the scarring and formation of a nodule on the tendon.
Trigger finger causes:
While trigger finger often has no apparent cause, the factors below may make you more likely to develop it:
Repetitive movement and gripping, such as using power tools at work, may be linked to trigger finger, though there is no evidence to support this.
You may be more likely to develop trigger finger if you have any of the following medical conditions:
Always see your GP if you notice any clicking, stiffening or pain in your fingers or thumbs.Your GP will base a diagnosis on an examination of your hands and the history of your symptoms in an attempt to establish the trigger finger causes.
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