What is Trigger Finger?
The flexor tendons of the hand are surrounded by a protective sheath, that allows fingers to flex and bend. When the tendon’s sheath becomes irritated or inflamed, it interferes with the gliding motion of the tendon through the sheath. This can cause blocking and subsequent inflammation. This blockage usually occurs in the narrower area of the sheath called the pulley. Sometimes a nodule (lump) may form in the tendon and further contribute to the blockage.
In concrete terms, this means that the affected finger snaps and hurts when it is extended. Sometimes the finger remains blocked in flexion or complete flexion is no longer possible. Often there is pain at the base of the finger.