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Quantitative anatomical study of the posterior interosseous nerve
N A Ebraheim1, F Jin, D Pulisetti
1Orthopaedic Surgery Department, Medical College of Ohio, USA.
American Journal of Orthopedics (Belle Mead, N.J.)
|September 29, 2000
Summary
This study measured the posterior interosseous nerve (PIN) anatomy in cadavers, detailing its segments and relationships with the radius and ulna. Findings provide crucial anatomical data for understanding nerve pathways and potential entrapment sites.
Area of Science:
- Anatomy
- Orthopedics
- Surgical Anatomy
Background:
- The posterior interosseous nerve (PIN) is crucial for forearm extensor muscle function.
- Understanding PIN anatomy is vital for diagnosing and treating conditions like radial tunnel syndrome.
Purpose of the Study:
- To conduct an anatomic study of the posterior interosseous nerve (PIN) in cadaver upper limbs.
- To measure various segments of the PIN and its relationship with the radius and ulna.
Main Methods:
- Anatomical dissection of 20 cadaver upper limbs.
- Measurement of PIN segments, including length from the radial head to the arcade of Frohse (AF) and PIN exit point.
- Characterization of the arcade of Frohse (tendinous vs. membranous) and its dimensions.
Main Results:
- Detailed measurements of PIN length and distances to bony landmarks (radial head, supinator exit, radial/ulnar margins) are provided for male and female cadavers.
- The arcade of Frohse was tendinous in 70% and membranous in 30% of specimens, with specific dimensions reported.
- The PIN consistently exited distally within the supinator muscle, with defined distances to its branches.
Conclusions:
- This study provides precise anatomical data on the posterior interosseous nerve and its relationship with surrounding structures.
- The findings contribute to a better understanding of the surgical anatomy of the PIN, aiding in clinical diagnosis and treatment strategies.