Trigger Finger

(Stenosing Tenosynovitis; Volar Flexor Tenosynovitis)


Tendons connect bones to muscles in the body. Flexor tendons of the thumb and fingers pull the fingers into a fist. The tendons are enclosed in a synovial sheath. When this sheath becomes inflamed it can cause trigger finger.Usually, tendons slide easily through the sheath as the finger moves. In the case of trigger finger, the synovial sheath is swollen. The tendon cannot move easily. This causes the finger to remain in a flexed (bent) position. In mild cases, the finger may be straightened with a pop. In severe cases, the finger becomes stuck in the bent position. Usually, this condition can easily be treated.
Trigger Finger
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Many cases of trigger finger are caused by:

Risk Factors

Trigger finger is more common in women, and in people aged 40-60 years old. Other factors that may increase your chance of trigger finger include:
  • Overuse of the hand from repetitive motions, which can occur from:
    • Computer operation
    • Machine operation
    • Repeated use of hand tools
    • Playing musical instruments
  • History of certain diseases, such as:


Trigger finger may cause:
  • Finger or thumb stiffness
  • Finger, thumb, or hand pain
  • Swelling or a lump in the palm
  • Catching or popping when straightening the finger or thumb
  • Finger or thumb stuck in bent position

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