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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.
Other causes of de Quervain's tenosynovitis include: Direct injury to your wrist or tendon; scar tissue can restrict movement of the tendons . Inflammatory arthritis, such as rheumatoid arthritis . Risk factors. People between the ages of 30 and 50 have a higher risk of developing de Quervain's tenosynovitis than do those in other age groups.