Abstract
Purpose
Cross-sectional sonographic measurements are considered first-line confirmatory tests in diagnosing peripheral nerve entrapment syndromes. Our aim is to establish normal values of cross-sectional area of the posterior interosseous nerve (PIN) at the arcade of Frohse, the most common site of compression of this nerve.
Methods
The PIN was identified with ultrasound on 50 healthy adults and 30 cadavers. Measurements of the cross-sectional area (CSA), antero-posterior (AP) and lateral (L) distances were taken immediately proximal and distal to the arcade of Frohse.
Results
The mean AP and L distances of the PIN proximal to the arcade of Frohse were 0.111 cm (0 ± 0.021) and 0.266 cm (±0.058), respectively, while the mean AP and L distances of the PIN distal to the arcade of Frohse were 0.085 cm (±0.019) and 0.343 cm (±0.057), respectively. P squared testing showed a statistically significant difference between the AP and lateral distances of the PIN when comparing proximal and distal to the arcade (p ≤ 0.001). However, the mean CSA of the PIN measured immediately proximal to the arcade of Frohse was 0.022 cm2 (±0.005); immediately distal to the arcade of Frohse, it was 0.023 cm2 (±0.004). t test showed no statistical difference between the two regions (p = 0.11).
Conclusions
Our study has provided reference values for the PIN in healthy individuals at the arcade of Frohse. Although, there is a flattening of the nerve as it enters the supinator muscle, this should not be mistaken for nerve entrapment as the size of the nerve remains consistent.
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Acknowledgments
The authors wish to thank Jessica Holland, MS, Medical Illustrator at St. George’s University, Grenada, West Indies, for the creation of her illustrations used in this publication. We also wish to acknowledge the persons who kindly volunteered to participate in this project as well as the individuals who donated their bodies, without whom this project would not have been possible.
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The authors declare that there are no conflicts of interest of any kind.
Ethical considerations
The study was approved by the institutional review board (IRB/13053) and written individual informed consent was obtained from all participants. All cadaver specimens were handled in accordance to the laws and regulations of the country in which the study was performed. The specimens used for this research are protected under IRB approval (06014) as issued by the School of Medicine at St Georges University Grenada.
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Raeburn, K., Burns, D., Hage, R. et al. Cross-sectional sonographic assessment of the posterior interosseous nerve. Surg Radiol Anat 37, 1155–1160 (2015). https://doi.org/10.1007/s00276-015-1487-7
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DOI: https://doi.org/10.1007/s00276-015-1487-7