Laxity of the ulnar nerve during elbow flexion and extension

The Journal of Hand Surgery
Christine B NovakHerbert P von Schroeder

Abstract

To evaluate the dynamic anatomy of the ulnar nerve at the elbow. We studied 11 fresh cadavers. We placed metal clips on the ulnar nerve at three locations: at the medial epicondyle (point A), 3 cm proximal to the epicondyle (point B), and 14 cm proximal to the epicondyle (point C). The distances from the medial epicondyle to points A, B, and C on the ulnar nerve and between each pair of points were measured in full elbow extension and flexion. With full elbow flexion, there was no movement of the ulnar nerve at point A (adjacent to the medial epicondyle). Point A and the adjacent distal ulnar nerve moved as a unit with the forearm around the medial epicondyle. Proximal to the cubital tunnel, there was significant ulnar nerve excursion (P < .01) at points B (0.7 ± 0.3 cm) and C (0.2 ± 0.2 cm). There was differential excursion of the ulnar nerve at points B and C relative to the medial epicondyle. The distances between the markers revealed that the nerve did not stretch to account for the discrepant distances of the 3 points, but a slack region of the nerve proximal to the medial epicondyle was taken up with flexion. Release of the intermuscular septum and the canal of Struthers did not influence movement of the nerve. With elbow...Continue Reading

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Citations

Nov 26, 2013·The Orthopedic Clinics of North America·Christopher T PlastarasAshot S Kotcharian
Apr 26, 2014·Journal of Neural Engineering·Lee E FisherRobert A Gaunt
Oct 3, 2019·Journal of Neural Engineering·Ameya C NanivadekarLee E Fisher
Jun 15, 2017·Journal of Pediatric Orthopedics·Samantha L PiperCharles A Goldfarb
Mar 4, 2015·Neurosurgery·Mark A MahanSameer B Shah
Apr 17, 2019·Muscle & Nerve·Kevin Hsu, Lawrence R Robinson
May 21, 2020·Journal of Neural Engineering·Christi L KolarcikX Tracy Cui
Jul 11, 2021·Skeletal Radiology·Yoav MoragLynda C Yang

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