The Ulnar Nerve at Elbow Extension and Flexion: Assessment of Position and Signal Intensity on MR Images

Radiology
Yasuhiro KawaharaMasataka Uetani

Abstract

Purpose To assess the position and signal intensity of the ulnar nerve at elbow extension and flexion by using magnetic resonance imaging. Materials and Methods Institutional review board approval and written informed consent were obtained. Transverse T2-weighted images were obtained perpendicular to the upper arm in 100 healthy elbows of 50 volunteers (23 men, 27 women; age range, 21-57 years) and nine elbows with ulnar neuropathy (five men, four women; age range, 24-59 years) with extension and 130° of flexion. Ulnar nerve position was classified into three types: no dislocation, subluxation, or dislocation. One-way analysis of variance, paired t tests, Student t tests, and multiple regression analysis were used to analyze correlations between ulnar nerve movement angle during flexion and age, sex, presence of the anconeus epitrochlearis muscle, and ulnar neuropathy and to compare the contrast-to-noise ratio of nerve to muscle between extension and flexion. Results Nerve positions in healthy elbows were as follows: All had no dislocation at extension, and at flexion, 51 of 100 elbows (51.0%) had no dislocation, 30 of 100 elbows (30.0%) had subluxation, and 19 of 100 elbows (19.0%) had dislocation. Nerve movement angle was sma...Continue Reading

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Citations

Jan 18, 2017·AJR. American Journal of Roentgenology·Tony T WongJonathan K Kazam
Apr 28, 2020·Neurosurgical Review·Stephen J BordesR Shane Tubbs
Mar 14, 2019·Journal of Ultrasound·Stacey M CornelsonNorman W Kettner
Nov 22, 2019·Current Reviews in Musculoskeletal Medicine·Soichi HattoriKentaro Onishi
Feb 9, 2021·The Surgeon : Journal of the Royal Colleges of Surgeons of Edinburgh and Ireland·Athikhun SuwannakhanKrai Meemon
Jun 23, 2021·PM & R : the Journal of Injury, Function, and Rehabilitation·Masashi KawabataKentaro Kamiya
Jul 25, 2021·Journal of Clinical Medicine·Keisuke TsukadaWataru Miyamoto

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