A cadaveric study of ulnar nerve strain at the elbow associated with cubitus valgus/ varus deformity

• Material Type: 博士論文
• Title: A cadaveric study of ulnar nerve strain at the elbow associated with cubitus valgus/ varus deformity
• Author/Editor: Nagashima, Mitsuyuki; Omokawa, Shohei; Nakanishi, Yasuaki; Mahakkanukrauh, Pasuk; Hasegawa, Hideo; Shimizu, Takamasa; Kawamura, Kenji; Tanaka, Yasuhito
• Author Heading: Nagashima, Mitsuyuki; Omokawa, Shohei; Nakanishi, Yasuaki; Mahakkanukrauh, Pasuk; Hasegawa, Hideo; Shimizu, Takamasa; Kawamura, Kenji; Tanaka, Yasuhito
• Publication, Distribution, etc.: BioMed Central
• Publication Date: 2022-09-01
• Publication Date (W3CDTF): 2022-09-01
• Alternative Title: 肘の内外反変形に伴う尺骨神経の伸長度変化に関する生体力学的研究
• Periodical title: BMC musculoskeletal disorders
• No. or year of volume/issue: 23 1
• Volume: 23
• Issue: 1
• Pages: Article No.829-
• ISSN (Periodical Title): ISSN : 1471-2474
• Degree grantor/type: 奈良県立医科大学
• Date Granted: 2023-03-15
• Dissertation Number: 甲第865号
• Degree Type: 博士（医学）
• Text Language Code: eng
• Subject Heading: Ulnar nerve strain; Cubitus valgus/varus deformity; Elbow flexion
• Target Audience: 一般
• Note (General): type:Thesis; Background: Cubital tunnel syndrome can be caused by overtraction and dynamic compression in elbow deformities. The extent to which elbow deformities contribute to ulnar nerve strain is unknown. Here, we investigated ulnar nerve strain caused by cubitus valgus/varus deformity using fresh-frozen cadavers. Methods: We used six fresh-frozen cadaver upper extremities. A strain gauge was placed on the ulnar nerve 2 cm proximal to the medial epicondyle of the humerus. For the elbow deformity model, osteotomy was performed at the distal humerus, and plate fixation was performed to create cubitus valgus/varus deformities (10°, 20°, and 30°). Ulnar nerve strain caused by elbow flexion (0–125°) was measured in both the normal and deformity models. The strains at different elbow flexion angles within each model were compared, and the strains at elbow extension and at maximum elbow flexion were compared between the normal model and each elbow deformity model. However, in the cubitus varus model, the ulnar nerve deflected more than the measurable range of the strain gauge; elbow flexion of 60° or more were considered effective values. Statistical analysis of the strain values was performed with Friedman test, followed by the Williams’ test (the Shirley‒Williams’ test for non-parametric analysis). Results: In all models, ulnar nerve strain increased significantly from elbow extension to maximal flexion (control: 13.2%; cubitus valgus 10°: 13.6%; cubitus valgus 20°: 13.5%; cubitus valgus 30°: 12.2%; cubitus varus 10°: 8.3%; cubitus varus 20°: 8.2%; cubitus varus 30°: 6.3%, P < 0.001). The control and cubitus valgus models had similar values, but the cubitus varus models revealed that this deformity caused ulnar nerve relaxation. Conclusions: Ulnar nerve strain significantly increased during elbow flexion. No significant increase in strain 2 cm proximal to the medial epicondyle was observed in the cubitus valgus model. Major changes may have been observed in the measurement behind the medial epicondyle. In the cubitus varus model, the ulnar nerve was relaxed during elbow extension, but this effect was reduced by elbow flexion.; 博士（医学）・甲第865号・令和5年3月15日; © The Author(s) 2022. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.; identifier:BMC musculoskeletal disorders Vol.23 No.1 Article No.829 (2022 Sep); identifier:14712474; identifier:http://ginmu.naramed-u.ac.jp/dspace/handle/10564/4097; identifier:BMC musculoskeletal disorders, 23(1): Article No.829
• Source: fulltext; http://ginmu.naramed-u.ac.jp/dspace/bitstream/10564/4097/1/01%e7%94%b2865%e6%9c%ac%e6%96%87%e3%81%ae%e8%a6%81%e6%97%a8.pdf; http://ginmu.naramed-u.ac.jp/dspace/bitstream/10564/4097/2/02%e7%94%b2865%e5%af%a9%e6%9f%bb%e8%a6%81%e6%97%a8.pdf; http://ginmu.naramed-u.ac.jp/dspace/bitstream/10564/4097/6/03%e7%94%b2865%e6%9c%ac%e6%96%87.pdf
• Access Restrictions: インターネット公開
• Related Material (DOI): 10.1186/s12891-022-05786-9
• Periodical Title (NCID): AA12035278; https://ci.nii.ac.jp/ncid/AA12035278
• Data Provider (Database): 国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）; https://irdb.nii.ac.jp
• Original Data Provider (Database): 奈良県立医科大学 : 奈良県立医科大学機関リポジトリ GINMU