A patient presents with difficulty extending their wrist following trauma to the posterior forearm. Which of the following muscles would be most affected by injury to the posterior interosseous nerve?
AExtensor carpi ulnaris
BExtensor carpi radialis brevis
CExtensor pollicis longus
DExtensor digitorum
A 34-year-old woman comes to the physician because of a 3-month history of pain in her right thumb and wrist that radiates to her elbow. It is worse when she holds her infant son and improves with the use of an ice pack. Six months ago, she slipped on a wet floor and fell on her right outstretched hand. Her mother takes methotrexate for chronic joint pain. The patient takes ibuprofen as needed for her current symptoms. Examination of the right hand shows tenderness over the radial styloid with swelling but no redness. There is no crepitus. Grasping her right thumb and exerting longitudinal traction toward the ulnar side elicits pain. Range of motion of the finger joints is normal. There is no swelling, redness, or tenderness of any other joints. Which of the following is the most likely diagnosis?
ADe Quervain tenosynovitis
BCarpal tunnel syndrome
CSwan neck deformity
DMallet finger
EStenosing tenosynovitis
A 43-year-old woman comes to the physician because of tingling and weakness in her left arm for the past 2 days. An image of the brachial plexus is shown. Nerve conduction study shows decreased transmission of electrical impulses in the labeled structure. Physical examination is most likely to show impairment of which of the following movements?
AOpposition of the thumb
BFlexion of the forearm
CAbduction of the shoulder above 100 degrees
DExtension of the wrist and fingers
EFlexion of the metacarpophalangeal joints
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