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Updated: Aug 5, 2025

Methods for In Vivo Biomechanical Testing on Brachial Plexus in Neonatal Piglets
Published on: December 19, 2019
Brachial Plexus Birth Injury: A Single-Center Study
Elena Caron1,2,3, Andrew J Gienapp1,4, Helen Files1,5
1Neuroscience Institute, Le Bonheur Children's Hospital, Memphis, TN, USA.
Insights
Brachial plexus birth injury (BPBI) in infants can cause lasting weakness. While some infants recover spontaneously, surgical outcomes for shoulder movement were limited in this small study.
Area of Science:
- Pediatric neurology
- Neonatal care
- Orthopedic surgery
Background:
- Brachial plexus birth injury (BPBI) is a common neonatal complication.
- Traction injuries to brachial plexus nerves during birth can lead to upper extremity weakness.
- Spontaneous recovery is possible, but persistent deficits necessitate further evaluation and intervention.
Purpose of the Study:
- To review the experience of a brachial plexus clinic with infants diagnosed with BPBI.
- To evaluate the Narakas Classification (NC) and Active Movement Scale (AMS) in this cohort.
- To identify clinic barriers affecting patient follow-up and data collection.
Main Methods:
- Retrospective chart review of infants with BPBI from September 2017 to September 2019.
- Assessment of Narakas Classification (NC) and Active Movement Scale (AMS) at follow-up intervals.
- Analysis of outcomes for both conservatively managed and surgically treated patients.
Main Results:
- Fifteen infants were included: 8 with NC-I, 5 with NC-II, and 2 with NC-III.
- By 7 months, 3 infants showed spontaneous recovery, while 8 achieved high AMS scores (5-7).
- Eleven surgically treated patients demonstrated minimal improvement in shoulder abduction and external rotation by 6 months.
Conclusions:
- This small sample suggests limited functional improvement in shoulder abduction and external rotation following surgery for BPBI.
- Clinic-specific challenges in follow-up, data collection, and interdisciplinary collaboration were identified.
- Further research with larger cohorts is needed to confirm these findings and optimize BPBI management.
Abstract:
Infants can sustain traction injury to brachial plexus nerves during birth, called brachial plexus birth injury (BPBI). While spontaneous recovery is possible, upper extremity weakness can linger. We report our experience at a brachial plexus clinic from a retrospective chart review of infants with BPBI from September 2017 to September 2019. We determined Narakas Classification (NC) and Active Movement Scale (AMS) at predetermined follow-up points. Of 15 patients, 8 presented with NC-I, 5 with NC-II, and 2 with NC-III without Horner's syndrome. By 7 months, 3 had spontaneous recovery, and 4 achieved all and another 4 achieved most AMS5-7 scores. Eleven patients undergoing surgery had little-to-no improvement of shoulder abduction and shoulder external rotation AMS categories by 6 months. Our small sample size prevents us from making definitive conclusions but gave beneficial insight into our clinic barriers to follow-up, data collection, and collaboration with physical and occupational therapy.
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