Jae Ho Kang1, Byung-Euk Joo, Ki Hoon Kim, Byung Kyu Park, Jaehyung Cha, Dong Hwee Kim. 1. From the Department of Internal Medicine, College of Medicine, Korea University, Seoul, Republic of Korea (JHK); Department of Neurology, Myongji Hospital, Seonam University School of Medicine, Gyeonggi-do, Republic of Korea (B-EJ); Department of Physical Medicine & Rehabilitation, College of Medicine, Korea University, Seoul, Republic of Korea (KHK, BKP, DHK); and Medical Science Research Center, Korea University Ansan Hospital, Gyeonggi-do, Republic of Korea (JC).
Abstract
OBJECTIVE: To evaluate the relationship between ulnar nerve instability and snapping of the triceps medial head during elbow flexion. DESIGNS: Twenty-six healthy individuals were recruited. The primary outcome measures were ultrasonographic and electrophysiological parameters of the ulnar nerve. Ulnar nerve instability was classified into three types based on the degree of ulnar nerve movement: no dislocation (Type N), subluxation (Type S), and dislocation (Type D). RESULTS: In the elbow 90-degree position, the incidences of Type N, S, and D were 41 (78.8%), 8 (15.4%), and 3 (5.8%) elbows, respectively; in the full flexion position, the incidences of Types N, S, and D were 24 (46.2%), 19 (36.5%), and 9 (17.3%) elbows, respectively. Spearman's correlation coefficients between ulnar nerve instability and snapping of the triceps medial head in the elbow 90-degree and full flexion positions were 0.808 and 0.889 (P < 0.001), respectively. The ulnar sensory response in Type S was of prolonged latency and decreased amplitude compared with that in Type N or D in the elbow full flexion position. CONCLUSIONS: Ulnar nerve instability increased with elbow flexion and correlated with snapping of the triceps medial head. Ultrasonography of the ulnar nerve is an important tool in ulnar nerve instability assessment.
OBJECTIVE: To evaluate the relationship between ulnar nerve instability and snapping of the triceps medial head during elbow flexion. DESIGNS: Twenty-six healthy individuals were recruited. The primary outcome measures were ultrasonographic and electrophysiological parameters of the ulnar nerve. Ulnar nerve instability was classified into three types based on the degree of ulnar nerve movement: no dislocation (Type N), subluxation (Type S), and dislocation (Type D). RESULTS: In the elbow 90-degree position, the incidences of Type N, S, and D were 41 (78.8%), 8 (15.4%), and 3 (5.8%) elbows, respectively; in the full flexion position, the incidences of Types N, S, and D were 24 (46.2%), 19 (36.5%), and 9 (17.3%) elbows, respectively. Spearman's correlation coefficients between ulnar nerve instability and snapping of the triceps medial head in the elbow 90-degree and full flexion positions were 0.808 and 0.889 (P < 0.001), respectively. The ulnar sensory response in Type S was of prolonged latency and decreased amplitude compared with that in Type N or D in the elbow full flexion position. CONCLUSIONS: Ulnar nerve instability increased with elbow flexion and correlated with snapping of the triceps medial head. Ultrasonography of the ulnar nerve is an important tool in ulnar nerve instability assessment.
Authors: Luca Maria Sconfienza; Domenico Albano; Georgina Allen; Alberto Bazzocchi; Bianca Bignotti; Vito Chianca; Fernando Facal de Castro; Elena E Drakonaki; Elena Gallardo; Jan Gielen; Andrea Sabine Klauser; Carlo Martinoli; Giovanni Mauri; Eugene McNally; Carmelo Messina; Rebeca Mirón Mombiela; Davide Orlandi; Athena Plagou; Magdalena Posadzy; Rosa de la Puente; Monique Reijnierse; Federica Rossi; Saulius Rutkauskas; Ziga Snoj; Jelena Vucetic; David Wilson; Alberto Stefano Tagliafico Journal: Eur Radiol Date: 2018-06-06 Impact factor: 5.315