Faculty of Sports Science, Waseda University, 2-579-15 Mikajima, Tokorozawa, Saitama, Japan.
Faculty of Sports Science, Waseda University, 2-579-15 Mikajima, Tokorozawa, Saitama, Japan.
J Biomech. 2023 Aug;157:111750. doi: 10.1016/j.jbiomech.2023.111750. Epub 2023 Aug 2.
Since elbow injuries are common in adolescent baseball players, this study aimed to determine the relationship between musculoskeletal status and elbow injuries in 47 baseball players aged 12-14 years. Participants answered a questionnaire and had their general body measurements taken. Magnetic resonance imaging was used to evaluate muscle cross sectional areas (CSA) of the upper arm flexor and extensor muscles, and x-ray absorptiometry was used to determine the mass of the upper arm and the total mass of the forearm and hand. Shear wave elastography was used to determine muscle stiffness of the biceps brachii, brachialis, pronator teres, and brachioradialis. An orthopedic surgeon performed a clinical assessment and elbow ultrasonography for each participant to diagnose elbow injuries. The measured values were compared between the elbow injury and control groups using two-sample t-tests. The elbow injury group had significantly higher muscle stiffness in the brachialis (p < 0.001) and brachioradialis (p = 0.004) muscles and greater elbow flexor CSA of the distal upper arm (p = 0.004) than the control group. The total mass of the forearm and hand and the mass ratio of the forearm and hand to the upper arm were significantly greater in the elbow injury group than in the control group (p = 0.002 and p < 0.001). Thus, it may be necessary to increase flexibility of the brachialis and brachioradialis flexible by stretching and massaging in addition to evaluating the mass distal to the elbow and the elbow flexor muscle size of the distal upper arm to manage elbow injury in youth baseball players. Characteristics of Upper Limb Mass, Muscle Cross-Sectional Area and Stiffness in Adolescent Baseball Players with and without Elbow Injury.
由于肘部损伤在青少年棒球运动员中很常见，因此本研究旨在确定 47 名 12-14 岁棒球运动员的骨骼肌肉状况与肘部损伤之间的关系。参与者回答了一份问卷，并进行了一般身体测量。使用磁共振成像评估上臂屈肌和伸肌的肌肉横截面积（CSA），使用 X 射线吸收法测量上臂质量以及前臂和手部的总质量。使用剪切波弹性成像评估肱二头肌、肱肌、旋前圆肌和肱桡肌的肌肉硬度。每位参与者都由骨科医生进行临床评估和肘部超声检查，以诊断肘部损伤。使用两样本 t 检验比较肘部损伤组和对照组的测量值。肘部损伤组的肱肌（p < 0.001）和肱桡肌（p = 0.004）肌肉的肌肉硬度以及远侧上臂屈肌 CSA 显著更高（p = 0.004），与对照组相比。前臂和手部的总质量以及前臂和手部与上臂的质量比在肘部损伤组显著大于对照组（p = 0.002 和 p < 0.001）。因此，除了评估肘部和远侧上臂屈肌肌肉大小之外，可能还需要增加肱肌和肱桡肌的柔韧性，通过伸展和按摩来管理青少年棒球运动员的肘部损伤。有和没有肘部损伤的青少年棒球运动员上肢质量、肌肉横截面积和硬度的特征。
