Peripheral Nerve Disorders
A 48-year-old man presents with 3 months of progressive weakness in extending his fingers and thumb. He denies pain or sensory changes. On examination, he cannot extend the MCP joints of his fingers or extend and abduct his thumb. Wrist extension is present but with radial deviation. The extensor carpi radialis brevis and longus are functioning. Regarding posterior interosseous nerve (PIN) syndrome:
Mark each as TRUE or FALSE
The posterior interosseous nerve (PIN) is the deep motor branch of the radial nerve that arises at t...
PIN syndrome causes weakness of finger MCP extension (EDC, EIP), thumb extension (EPL, EPB), thumb a...
PIN syndrome causes sensory loss over the dorsal hand and thumb web space; the brachioradialis and E...
Causes of PIN compression include the arcade of Frohse, fibrous bands within the supinator, the leas...
Finger and thumb IP extension is preserved in PIN syndrome because the lumbricals and interossei (me...
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Click T (True) or F (False) for each option