横足根関節回内制限が片脚立位時の体幹回旋可動域に与える影響について

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  • The Relationship between Limitation of Motion of the Transverse Tarsal Joint and Range of Trunk Rotation in Hemi-Standing
  • オウソクコン カンセツ カイナイ セイゲン ガ カタアシ リツイジ ノ タイカン カイセン カドウイキ ニ アタエル エイキョウ ニ ツイテ

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The purpose of this study is to examine the effect of the range of motion (ROM) in pronation of the transverse tarsal joint on trunk motion in standing and hemi-standing. We investigated whether ROM on pronation of the transverse tarsal joint affected trunk rotation in standing and hemi-standing. Subjects were eight healthy persons (five males and three females), sixteen lower extremities. Each subject had bilateral ROM on pronation of the transverse tarsal joint measured with a goniometer, and classified sa the hypo-mobility side (ROM on pronation of transverse tarsal joint <10°) or normal-mobility side (ROM on pronation of the transverse tarsal joint ≥10°). And each subject also had ROM of trunk rotation measured on the supporting side in standing and hemi-standing with a goniometer. We compared the normal-mobility side with the hypo-mobility side as to the ROM of trunk rotation in standing and hemi-standing. Compared with the normal-mobility side, the ROM of trunk rotation was significantly decreased on the hypo-mobility side in hemi-standing (p<0.01). Consequently, the limitation of ROM in pronation of the transverse tarsal joint increases the degree of eversion of the subtalar joint in hemi-standing, and increases the degree of eversion of the subtalar joint in hemi-standing causing loss of stability of the lower extremities in hemi-standing. As a result of this study, we believe that on the hypo-mobility side, loss of stability of the lower extremities disturbs the cooperative connection between the lower extremities and the pelvis in hemi-standing. We concluded that trunk rotation in hemi-standing on the hypo-mobility side is decreased due to disturbance of the cooperative connection between the lower extremities and the pelvis in hemi-standing.<br>

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