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Ultrasound combined with electrodiagnosis improves lesion localization and outcome in posterior interosseous neuropathy
Author(s) -
Wininger Yevgeniya Dvorkin,
Buckalew Neilly A.,
Kaufmann Robert A.,
Munin Michael C.
Publication year - 2015
Publication title -
muscle and nerve
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.025
H-Index - 145
eISSN - 1097-4598
pISSN - 0148-639X
DOI - 10.1002/mus.24782
Subject(s) - denervation , medicine , lesion , electromyography , electrodiagnosis , weakness , multifocal motor neuropathy , ultrasound , ulnar neuropathy , concentric , surgery , radiology , anatomy , physical medicine and rehabilitation , ulnar nerve , mismatch negativity , geometry , mathematics , electroencephalography , elbow , psychiatry
ABSTRACT Introduction: Posterior interosseous nerve (PIN) syndrome is a rare compression neuropathy. Electrodiagnostic studies (EDx) combined with neuromuscular ultrasound (US) enable precise lesion localization and may improve patient outcome. Methods: In 4 patients with finger extension weakness, US was used to accurately localize concentric electromyographic (EMG) needle placement in PIN muscles and to visualize the lesion site. Results: EMG with US guidance showed decreased recruitment with abnormal configuration in PIN muscles. Active denervation was not always observed. US scanning demonstrated larger PIN diameter in the affected arm. All patients had surgical intervention to confirm EDx and US findings and had improved outcome on follow‐up. Conclusion: These cases demonstrate the benefits of augmenting EDx with US by guiding accurate electrode localization and providing diagnostic information about lesion location. Muscle Nerve 52 : 1117–1121, 2015