Nerve Compression Syndromes
A 50-year-old woman presents with progressive inability to extend her fingers at the MCP joints for 3 months. She reports no pain and has no sensory symptoms. Examination reveals weakness of finger MCP extension (EDC, EIP, EDM) and thumb extension/abduction (EPL, EPB, APL), but wrist extension is preserved with radial deviation (ECRL/ECRB intact). Sensation is intact throughout. EMG confirms denervation of PIN-innervated muscles. Regarding posterior interosseous nerve (PIN) syndrome:
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The posterior interosseous nerve (PIN) is the deep motor branch of the radial nerve that arises at t...
Sites of PIN compression include the arcade of Frohse (most common, present in 30% as fibrous band),...
PIN syndrome is primarily a sensory condition; the arcade of Frohse is distal to the supinator; PIN ...
Clinical findings: weakness of finger MCP extension (EDC, EIP, EDM), weakness of thumb extension/abd...
Treatment: non-operative management (splinting, activity modification, therapy) for 3 months initial...
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Click T (True) or F (False) for each option