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Extensor tendon lacerations (wounds, cuts or tears) of the hand and fingers are quite common injuries, and can occur at many different levels. They are often associated with deep structure damage, such as bone, joint and ligamentous support. Symptoms include one or more of the following: loss of function or strength, diminished range of motion, and weakness when straightening the fingers or hand.

Tendinitis occurs when a tendon becomes irritated, inflamed or swollen and causes the synovium around the tendon to swell, changing the shape of the tendon sheath compartment and making it difficult for the tendons to move properly. Tendinitis can cause pain and tenderness along the hand or wrist that is particularly noticeable when grasping or gripping, forming a fist, or turning the wrist.