Trigger Finger / Thumb
Trigger finger (stenosing tenosynovitis) is a painful condition that affects the tendons in the hand. In the hand, tendons run down the bones in the fingers and are attached to the muscles in the forearm.
The tendons are held in place on the bones by a series of ligaments (strong bands of tissue) called pulleys. These are shaped like arches over the tendon, attaching it to the bone. The pulleys form a tunnel, or sheath, on the surface of the bone, which the tendons slide through.