2023 Fiscal Year Final Research Report

Survey and support for hyperextension of the thumb metacarpophalangeal joint in infants

Research Project

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Project/Area Number	20K02687
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Review Section	Basic Section 09030:Childhood and nursery/pre-school education-related
Research Institution	Shizuoka Sangyo University
Principal Investigator	SATO Hiroko 静岡産業大学, 経営学部(磐田), 教授 (10823700)
Co-Investigator(Kenkyū-buntansha)	中井真吾静岡産業大学, スポーツ科学部, 准教授 (30795381) 吉田茂別府溝部学園短期大学, 教育学部, 特任教授 (60829349) 島田達生大分大学, 医学部, 客員研究員 (80080555) 坂本智則大分大学, 医学部, 助教 (40894514)
Project Period (FY)	2020-04-01 – 2024-03-31
Keywords	造形活動 / 造形遊び / 母指中手指節関節 / ハサミ操作 / 過伸展 / 援助 / 造形表現 / 発育発達
Outline of Final Research Achievements	As a result of investigating the passive extension angle of the thumb MP joint in infants, the following three points were derived. 1. Although there are individual differences, there have been no cases where the angle exceeds 60 degrees, 2. Most infants acquire the ability to avoid hyperextension during daily hand activities, and 3. How to assist infants who hyperextend when using scissors. An anatomical study of the thumb MP joint was performed using specimens from infant monkeys. As a result of searching for microscopic images using an optical microscope and a scanning electron microscope, the following was derived. 1. In previous studies in adults, the cartilage plate was described as a fibrous component, but in infant monkeys it was a hyaline cartilage component. 2. The fibrous and membranous parts of the cartilage plate contain not only collagen fibers but also elastic fibers.
Free Research Field	幼児教育　造形表現
Academic Significance and Societal Importance of the Research Achievements	本研究は母指MP関節過伸展症軽度罹患幼児の実態を明らかにし、幼児の将来のQOLの向上を目指している。これまで国際的にもほとんど調査されてこなかった幼児の当該関節の受動的伸展状況の実態調査と追跡調査を実施し、我が国の幼児の当該関節を介した母指の発育発達の状態が明らかとなった。次にハサミ操作時における当該関節の状態を観察し、過伸展と巧緻性との関係を明らかにした。当該関節掌側板の組織構造については幼児サルの試料を用い、光学顕微鏡的検索と走査電子顕微鏡での観察をおこなった。これまで成人を対象とした研究報告だけであったが、幼児サルを観察したところ、成人にはみられない新しい知見を得ることができた。