Dynamic analysis of the ulnar nerve in the cubital tunnel using ultrasonography

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• 作者：Kenichi Nakano ; MD ; Keiichi Murata ; MD ; PhD ; Shohei Omokawa ; MD ; PhD ; ^{omokawa@naramed-u.ac.jp" class="auth_mail} ; Yasuaki Nakanishi ; MD ; Takamasa Shimizu ; MD ; Tsutomu Kira ; MD ; Tadanobu Onishi ; MD ; Yasuhito Tanaka ; MD ; PhD
• 关键词：Basic Science ; Anatomy Study ; Imaging
• 刊名：Journal of Shoulder and Elbow Surgery
• 出版年：July 2014
• 年：2014
• 卷：23
• 期：7
• 页码：933-937
• 全文大小：286 K

文摘

We investigated the dynamics of the ulnar nerve during elbow flexion and the relationships between these dynamics and the morphology of the ulnar nerve groove in healthy individuals.

Materials and methods

Twenty healthy volunteers (40 elbows) underwent ultrasonographic examination of the ulnar nerve at the elbow. We measured the breadth and depth of the ulnar nerve groove at 90° of elbow flexion and calculated the depth-to-breadth ratio. We recorded the distance from the trochlea of the humerus to the nerve and the short-axis diameter of the nerve at 30°, 60°, 90°, and 120° of elbow flexion. We calculated the medial shift and flattening of the ulnar nerve at each angle relative to 30° of flexion, compared the values among the different angles, and compared the depth-to-breadth ratio with the location, medial shift, and flattening ratio of the ulnar nerve.

Results

The medial shift was significantly greater at 120° than at other angles (P < .001). Flattening increased with increasing elbow flexion and was significantly different at 60°, 90°, and 120° (all P < .001). The flattening ratios were significantly correlated with the depth-to-breadth ratio at 120° (r = −0.43, P = .005).

Conclusions

The ulnar nerve moves medially and is flattened with the elbow flexed between 90° and 120°. When the ulnar nerve groove is shallow, high degrees of elbow flexion result in flattening of the ulnar nerve in the groove.