*** Tends to develop 4-6 weeks after delivery, common mechanisms include lifting a baby or young child into the air by placing the phalanges under their axillae with the thumbs abducted ** Activities include: Housekeeping tasks, typing, texting, lifting, knitting, needlepoint, wrestling, or bowling Repetitive overuse of the wrist in ulnar or radial deviation with thumb extended or abducted** Second most common entrapment tendinitis of the wrist 23 Epidemiology including risk factors and primary prevention Prevalence 3 Symptoms are triggered by repetitive thumb movement, along with ulnar and radial wrist deviation. This thickening results in repetitive tension on the tendons causing swelling which restricts gliding of the tendons through the sheath. Rather than secondary to an acute inflammatory process, the thickening is a result of fibrous tissue deposits and increased vascularity along the extensor retinaculum. De Quervain tenosynovitis symptoms result from non-inflammatory fibrous thickening of the first extensor compartment tendon sheath, which surrounds the APL and EPB, at the level of the radial styloid process. The exact etiology of de Quervain tenosynovitis is unknown. Common names include: de Quervain disease, de Quervain syndrome, de Quervain tenosynovitis, de Quervain tendinopathy, stenosing tenosynovitis of the first dorsal compartment of the wrist, gamer’s thumb, and mother’s thumb.While commonly labeled as de Quervain tenosynovitis, a tendinopathy is more appropriate as histopathological evidence demonstrates this condition is not characterized by inflammation, but rather by thickening of the tendon sheath itself.It is characterized by pain and/or tenderness along the radial aspect of the wrist with resultant swelling and in restricted, painful movements. De Quervain tenosynovitis is thickening of the fibrous sheaths of two tendons at the base of the thumb, the abductor pollicis longus (APL) and extensor pollicis brevis (EPB).
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