&Dequervain's Tenosynovitis=De Quervain tenosynovitis is an entrapment tendinitis of the tendons contained within the first dorsal compartment at the wrist; it causes pain during thumb motion. The tendons of the abductor pollicis longus and the extensor pollicis brevis are tightly secured against the radial styloid by the overlying extensor retinaculum. Any thickening of the tendons from acute or repetitive trauma restrains gliding of the tendons through the sheath. Crepitus may be palpated. Patients with De Quervain tenosynovitis note pain resulting from thumb and wrist motion, along with tenderness and thickening at the radial styloid. Patients frequently are mothers of infants aged 6-12 months, and symptoms are often noted in both wrists. Repetitive lifting of the baby as it grows heavier is responsible for friction tendinitis. De Quervain tenosynovitis can also develop in individuals who have sustained a direct blow to the area of the first dorsal compartment. On examination the first dorsal compartment over the radial styloid becomes thickened and feels bone hard; the area becomes tender. The Finkelstein test (consisting of flexion of the thumb across the palm and then ulnar deviation of the wrist) causes sharp pain at the first dorsal compartment.