Background: Shoulder abnormalities are the major cause of morbidity in upper brachial plexus birth palsy (BPBP). We developed a rat model of upper trunk BPBP and compared our findings to previously reported animal models and to clinical findings in humans.Methods: Forty-three 5-day-old newborn rats underwent selective upper trunk neurectomy of the right brachial plexus and were studied 3 to 20 weeks after surgery. The passive shoulder external rotation was measured and the shoulder joint was assessed bilaterally by a 7.2T MRI bilaterally.Results: We found a marked decrease in passive shoulder external rotation, associated with a severe subscapularis muscle atrophy and contracture. None however developed the typical pattern of glenohumeral dysplasia.Conclusions: In contradiction with previous reports, our study shows that the rat model is not adequate for preclinical studies of shoulder dysplasia. However, it might serve as a useful model for studies analyzing shoulder contracture occurring after upper BPBP. © 2012 Soldado et al.; licensee BioMed Central Ltd.
|Journal||Journal of Brachial Plexus and Peripheral Nerve Injury|
|Publication status||Published - 6 Dec 2012|
- Erb's palsy
- Glenohumeral dysplasia
- Shoulder anomalies following brachial plexus birth palsy
- Shoulder internal rotation contracture