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De Quervain's tenosynovitis is inflammation of tendons on the side of the wrist at the base of the thumb. These tendons include the extensor pollicis brevis and the abductor pollicis longus tendons, which extend the joints of the thumb. De Quervain's tenosynovitis can be brought on by simple strain injury to the extensor pollicis longus and abductor pollicis tendons (tendinitis). Often this form of tendinitis is a result of repetitive motion injury.
The most common tendon that is involved is the tendon to the extensor carpi radialis brevis, or ECRB. Overuse of this area causes damage to the tendon and results in pain with wrist movement. Tennis elbow is a degeneration of the tendon that attaches the wrist extensor muscles to the elbow.A tendon attaches a muscle to bone. In this case, the ECRB is the muscle, and it attaches to the lateral epicondyle. In cases of overuse, the tendon can degenerate, which cause pain in the area.verview. Lateral epicondylitis, commonly known as âtennis elbowâ is a rather common condition that affects the tendons that arise off the bony prominence on the outside of the elbow, known as the lateral epicondyle. The tendons that come off this area are responsible for allow the wrist and fingers to extend.