A 41-year-old carpenter presents with progressive weakness of finger extension following repetitive screwdriver use. Vital signs are normal (BP 128/82, HR 72, RR 14, Temp 37°C). Examination reveals weak finger extension and radial wrist deviation; sensation over the dorsum of the hand is intact. EMG shows denervation in extensor carpi radialis and extensor digitorum muscles. Grip strength is preserved. Compression of which of the following nerves is the most likely cause?
- A)Ulnar nerve
- B)Median nerve
- C)Radial nerve
- D)Axillary nerve
- E)Posterior interosseous nerveGABARITO
Explicação
The posterior interosseous nerve is the deep motor branch of the radial nerve and is commonly compressed at the supinator. Because the superficial radial sensory branch is spared, patients have finger extensor weakness without a sensory deficit, exactly as in ... Ver explicação completa e trilha adaptativa →