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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.
De Quervain Disease affects the soft tissue in the thumb down to and including the juncture of the thumb with the wrist. De Quervain Disease is entrapment of the abductor pollicis longus and extensor pollicis brevis tendons as they pass beneath the extensor retinaculum at the radial styloid. The terms De Quervain Disease and De Quervain tenosynovitis are synonyms for the purposes of this guideline. Please note: Entitlement should be granted for a chronic condition only. For VAC purposes, chronic means that the condition has existed for at least 6 months.