Stenosing tenosynovitis, also known as “trigger finger,” is a repetitive strain injury that is one of the most common injuries in the workplace. It is marked by one finger or thumb that is stuck in a bent position and pops or snaps when straightened. It is caused by an inflamed or irritated flexor tendon.
As it slides through the sheath tunnel, the back and forth motion causes the irritation which can lead to thickening of the tendon and even the formation of nodules. This can impede it movement through the sheath which can also thicken so that the opening that the tendon slides through becomes smaller.
