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A 38-year-old mechanic develops aching pain in the proximal dorsal forearm after weeks of repetitive screwdriver use. He cannot extend the fingers well at the metacarpophalangeal joints. Wrist extension is preserved, but the wrist deviates radially when he extends it. Sensation over the dorsal first web space and the remainder of the hand is intact.
Injury to which nerve best explains this pattern?
ASuperficial radial nerve
BRadial nerve in the axilla
CMedian nerve at the carpal tunnel
DUlnar nerve at the elbow
EPosterior interosseous nerve
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