Changes in medial elbow joint space when difference in contraction strength of flexor-pronator muscle under elbow valgus stress.
Changes in medial elbow joint space when difference in contraction strength of flexor-pronator muscle under elbow valgus stress.
复制标题
肘外翻应力下屈旋旋肌收缩强度不同时肘关节内侧间隙的变化。
DOI：
10.1016/j.jse.2022.03.027
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Edama M.
中科院分区：
文献类型：
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作者：
Tsubono K;Kudo R;Yokota H;Hirabayashi R;Sekine C;Maruyama S;Shagawa M;Togashi R;Yamada Y;Edama M.
研究背景屈旋前肌收缩强度与肘外翻制动功能的关系尚不清楚。假设/目的本研究的目的是探讨肘外翻应力下屈旋前肌收缩强度不同时肘关节内侧间隙的变化。非优势手手肘关节用于测量。肢体测量的体位是坐在椅子上，肩部外展60°，外旋90°，肘部屈曲90°。首先，在60 N外翻应力下，使用握力计测量由抓握运动引起的FPM的最大自主收缩（MVC）。使用10%MVC、30%MVC和50%MVC的收缩强度。在起始肢体位置拍摄肘关节内侧间隙（JS）的超声图像。使用Telos器械系统，然后以+10 N/s逐渐增加载荷，在60 N外翻应力时，拍摄JS图像。此外，受试者在施加60-N外翻应力的情况下调整到设定的收缩强度（约5秒），并且在保持设定的收缩强度的同时拍摄JS的图像。每个MVC条件（10%MVC、30%MVC和50%MVC）均随机进行。结果与60-N外翻应力下的JS相比，60-N外翻应力+50%MVC下的JS显著降低。60 N肘外翻应力+50%MVC与起始肢体位置无显著性差异。结论FPMs可能需要肌肉活动≥ 50%MVC才能制动60 N肘外翻应力。
BackgroundThe relationship between contraction strength of the flexor-pronator muscles (FPMs) and elbow valgus braking function has not been clarified.Hypothesis/PurposeThe purpose of this study was to investigate changes in medial elbow joint space when there is a difference in contraction strength of FPMs under elbow valgus stress.MethodsSubjects were 20 healthy male university students, and the elbow joint on the nondominant hand side was used for measurements. The body position for limb measurement was sitting in a chair, with the shoulder abducted 60° and in 90° of external rotation, with 90° of elbow flexion. At first, maximum voluntary contraction (MVC) of the FPMs by grip motion was measured using a hand grip dynamometer under 60-N valgus stress. Contraction strengths of 10% MVC, 30% MVC, and 50% MVC were used. Ultrasonographic images of the medial elbow joint space (JS) were taken in the starting limb position. Using the Telos device system, load was then gradually increased by +10 N/s, and at the time of 60-N valgus stress, an image of the JS was taken. Furthermore, the subject adjusted to the set contraction strength (for about 5 sec) with 60-N valgus stress applied, and an image of the JS was taken while maintaining the set contraction strength. Each MVC condition (10% MVC, 30% MVC, and 50% MVC) was performed randomly. Three ultrasonographic images were taken within 10 seconds, and the average value of the three images was adopted as the JS.ResultsCompared with the JS under 60-N valgus stress, the JS was significantly reduced under 60-N valgus stress + 50% MVC. No significant difference was observed between the starting limb position and 60-N valgus stress + 50% MVC.ConclusionFPMs may require muscle activity ≥50% MVC to brake 60-N elbow valgus stress.