Peripheral Nerves
A 45-year-old woman presents 6 weeks after a humeral shaft fracture with radial nerve palsy that was noted immediately after injury. She has complete wrist drop and sensory loss over the first dorsal web space. EMG shows no motor unit potentials in radial-innervated muscles but the nerve remains in continuity on ultrasound. Regarding nerve injury classification and recovery:
Mark each as TRUE or FALSE
The Seddon classification includes neurapraxia (conduction block with intact axons, complete recover...
The Sunderland classification expands on Seddon: Grade I (neurapraxia), Grade II (axonotmesis with i...
Neurapraxia involves axonal disruption; axonotmesis does not cause Wallerian degeneration; Grade V i...
Wallerian degeneration occurs distal to the injury site within 48-72 hours, involving axon and myeli...
EMG and nerve conduction studies: denervation potentials (fibrillations, positive sharp waves) appea...
Answer the questions to see explanations
Click T (True) or F (False) for each option