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Trigger finger is a common complaint that causes pain and locking of the fingers.
The problem is due to the tendons of the fingers, and the sheath in which they run. The tendons are like ropes that attach to the ends of your fingers. When your muscle contracts, the flexor tendons pull the fingers into a fist. The tendons run part of their course through a sheath called the flexor tendon sheath. In trigger finger, this mechanism of movement is inhibited.