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See how your body works and what happens with a symptom, examination or treatment.

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Bent ring finger with a detail of a thickened flexor tendon at the pulley at the base of the finger.
Medical illustration · Bo Dòkter Enlarge image (new tab)

Muscles, bones and joints

Trigger finger

A thickened flexor tendon can catch at a tendon pulley. This can cause a finger to jerk or lock.