Stenosing tenosynovitis, also known as “trigger finger,” is a condition in which the flexor tendons of the fingers may get caught within their sheaths thereby limiting movement and causing pain. When the tendons are caught, the finger can get stuck temporarily in a flexed position. When the finger is then forced into full extension, a painful snap or click is felt, hence the name trigger finger. This condition is sometimes known as "stenosing tenosynovitis," as the common lesion seen in all forms of triggering is a relative narrowing (stenosis) of the space for the tendon relative to the size of the tendon itself.
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