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https://msapc.com/hand-center/wp-content/uploads/sites/6/2021/06/header-4.jpg1366500Definition Inflammation of two tendons (abductor pollicis longus and extensor pollicis brevis) and associated synovial membranes on the thumb side of the wrist (tenosynovitis). Symptoms Radial (thumb side) wrist pain that increases with extended activity. Increased pain with grasping and lifting. Pathology Shearing (friction) forces create inflammation and thickening of the extensor retinaculum (band shaped...