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The abductor pollicis brevis does this by acting across both the carpometacarpal joint and the metacarpophalangeal joint. Function Ībduction of the thumb is defined as the movement of the thumb anteriorly, a direction perpendicular to the palm. The abductor pollicis brevis is supplied by the recurrent branch of the median nerve (Roots C8-T1). Running lateralward and downward, it is inserted by a thin, flat tendon into the lateral side of the base of the first phalanx of the thumb, and the capsule of the metacarpophalangeal joint. It originates from the flexor retinaculum of the hand, the tubercle of the scaphoid bone, and additionally sometimes from the tubercle of the trapezium. It is a thenar muscle, and therefore contributes to the bulk of the palm's thenar eminence. The wrist may lose some range of motion.The abductor pollicis brevis is a flat, thin muscle located just under the skin. It’s important to improve the movements of grasp, pinch grip, and finger flexion before extension. Therapists should consider Activities of daily living, the patient's occupation, and leisure activities. Post-traumatic immobilisation in the metacarpophalangeal joint of the first finger. When de Quervain tenosynovitis goes untreated, it can become difficult to use the hand and wrist properly. Palmar abduction and opposition at the CMC joint must be adequate to enable the thumb to approximate to the tips of the fingers. These may contribute to de Quervain tenosynovitis. Jobs or hobbies that involve repetitive hand and wrist motions.Lifting a child repeatedly involves using the thumbs as leverage and may be associated with the condition. The condition may be associated with pregnancy.
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People between the ages of 30 and 50 have a higher risk of developing de Quervain tenosynovitis than do people in other age groups, including children. Risk factors for de Quervain tenosynovitis include:
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Tendons are ropelike structures that attach muscle to bone.Ĭhronic overuse, such as repeating a particular hand motion day after day, may irritate the covering around the tendons. Repeating a particular motion day after day may irritate the sheath around the two tendons, causing thickening and swelling that restricts their movement.ĭe Quervain tenosynovitis affects the two tendons on the thumb side of the wrist. When you grip, grasp, clench, pinch or wring anything in your hand, two tendons in your wrist and lower thumb normally glide smoothly through the small tunnel that connects them to the base of the thumb.