In trigger finger and thumb the guiders (flexor tendons) are dysfunctional and give rise to locking and / or pain in the finger and thumb. Despite the diagram showing an index finger, this is uncommon. Also please note that the digit locks in flexion ie. bent rather than straight.
Ring, middle and thumb are the commonly triggering digits. In the early stages a cortisone injection may work, or sometimes the condition will settle spontaneously. Exercise may also help.
In resistant cases wide awake trigger digit surgery may be a good option.
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