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Trigger Finger

Trigger Finger or Thumb involves the flexor tendons of the hand, which control bending movements of the fingers. When the finger or thumb is stretched out, it will seem to lock in position and be unable to move on its own, though it can be easily moved with the other hand or by another person. There may be a nodule, which may be slightly tender, at the base of the affected finger or thumb. Treatment may include anti-inflammatories, splinting, steroid injections into the affected area, or surgery.

 
RSI.org.uk