![]() ![]() When you bend or straighten your finger, the extensor tendons slide through snug tunnels, called tendon sheaths, that keep the tendons in place next to the bones. These structures are known as the extensor tendons (diagram below).Įxtensor tendons allow the finger and thumb joints to straighten-laceration of the tendons of the ring finger produces the image below (ring finger): The tendons on the dorsal (top) side extend the fingers and wrist. Long tendons extend from these muscles through the wrist and attach to the small bones of the fingers and thumb. The muscles that move the fingers and thumb are in the forearm. This causes parts of the body (such as a finger) to move. When muscles contract, tendons pull on bones. Tendons are tissues that connect muscles to bone. Certain conditions that weaken tendons (such as rheumatoid arthritis) can also be associated with spontaneous extensor tendon rupture. An extensor tendon injury can make it impossible to extend your fingers or thumb. The inability to perform these functions can severely limit hand and upper extremity function.Ī deep cut, overstretching or blunt trauma on the dorsal (top) side of your fingers, hand, wrist, or forearm can damage your extensor tendons, (often called by laymen “leaders”) which are the tissues that help control movement in your hand. It can make it hard for you to extend your wrist, open your hand, or straighten your fingers. A Patient’s Guide to Extensor Tendon Injuries IntroductionĪn extensor tendon injury is damage to the tissues on the back of the hand and fingers. ![]()
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