Abstract
Introduction: In this study we aimed to determine whether needle electromyographic assessment of voluntary motor unit recruitment in traumatic brachial plexus injuries could predict spontaneous motor recovery. Methods: A retrospective study was performed on patients with brachial plexus injury affecting deltoid, supraspinatus/infraspinatus, and biceps brachii. The outcome measure was strength on manual muscle testing at least 1 year after injury. Good outcome was considered strength >3/5 on the Medical Research Council (MRC) scale. Results: No muscles with no recruitment (n = 27) at 1-9 months improved to MRC 4/5 strength at a mean of 2.0 years postinjury. Twenty-five percent of muscles with discrete or severely reduced recruitment (n = 8) regained strength to >3/5 at a mean of 1.4 years postinjury (P =.047). Discussion: Absent voluntary motor unit potential recruitment at 1-9 months predicted poor prognosis for spontaneous recovery. A high percentage of patients with discrete recruitment did not improve to >3/5 strength. These patients should be considered for early nerve transfer surgery.
Original language | English (US) |
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Pages (from-to) | 595-597 |
Number of pages | 3 |
Journal | Muscle and Nerve |
Volume | 60 |
Issue number | 5 |
DOIs | |
State | Published - Nov 1 2019 |
Keywords
- brachial plexus injury
- motor unit potential recruitment
- nerve reconstruction
- nerve transfer
- upper trunk
ASJC Scopus subject areas
- Physiology
- Clinical Neurology
- Cellular and Molecular Neuroscience
- Physiology (medical)