肘部支撑对高中棒球运动员重复投球相关的内侧肘关节间隙增宽的影响。
The Effects of Elbow Bracing on Medial Elbow Joint Space Gapping Associated With Repetitive Throwing in High School Baseball Players.
作者信息
Hattori Hiroshi, Akasaka Kiyokazu, Otsudo Takahiro, Takei Keiichi, Yamamoto Mitsuru
机构信息
Saitama Medical University Graduate School of Medicine, Moroyama, Saitama, Japan.
Department of Rehabilitation, Saitama Medical Center, Saitama Medical University, Kawagoe, Saitama, Japan.
出版信息
Orthop J Sports Med. 2017 Apr 18;5(4):2325967117702361. doi: 10.1177/2325967117702361. eCollection 2017 Apr.
BACKGROUND
Throwing athletes risk medial elbow injury from extreme valgus stress generated across the medial elbow during throwing. Braces have been developed to protect the elbow joint; however, no previous study has investigated the effects of elbow bracing on medial elbow joint space gapping associated with repetitive throwing.
HYPOTHESIS/PURPOSE: The purpose of this study was to investigate the effects of elbow bracing on medial elbow joint space gapping during repetitive throwing. Our hypothesis was that an elbow brace may reduce mechanical stress on the elbow by reducing medial elbow joint space gapping.
STUDY DESIGN
Controlled laboratory study.
METHODS
Twenty-five high school baseball players participated in this study. Each subject pitched 100 times under 2 conditions: control (without elbow brace) and elbow brace. The ulnohumeral joint space was measured ultrasonically before pitching and after every block of 20 pitches. Measurement of the ulnohumeral joint space was carried out using ultrasound with the forearm hanging by the side. Two-way repeated-measures analysis of variance and post hoc tests were used to compare ulnohumeral joint space with repeated pitching and between the elbow brace and control conditions.
RESULTS
In the control condition, ulnohumeral joint space after 60 pitches was significantly greater than that before pitching ( < .01). In contrast, in the elbow brace condition, ulnohumeral joint space was not significantly different after repeated pitching. When comparing these 2 conditions, ulnohumeral joint space in the control condition was significantly greater than that in the elbow brace condition after 60 pitches ( < .01).
CONCLUSION
An elbow brace has the effect of preventing medial elbow joint space gapping with repeated throwing when determined ultrasonically by measuring the ulnohumeral joint space under gravity load.
CLINICAL RELEVANCE
An elbow brace worn during baseball pitching practice may help reduce mechanical stress on the elbow by reducing medial elbow joint space gapping.
背景
投掷运动员在投掷过程中，肘部内侧会承受极大的外翻应力，有导致内侧肘部受伤的风险。人们开发了护具来保护肘关节；然而，此前尚无研究探讨肘部护具对与重复性投掷相关的内侧肘关节间隙的影响。
假设/目的：本研究的目的是探讨肘部护具对重复性投掷过程中内侧肘关节间隙的影响。我们的假设是，肘部护具可通过减少内侧肘关节间隙来降低肘部的机械应力。
研究设计
对照实验室研究。
方法
25名高中棒球运动员参与了本研究。每位受试者在两种条件下各投球100次：对照（不戴肘部护具）和戴肘部护具。在投球前以及每20次投球一组后，使用超声测量尺肱关节间隙。测量尺肱关节间隙时，前臂垂于身体一侧，采用超声进行测量。采用双向重复测量方差分析和事后检验，比较重复投球过程中以及肘部护具与对照条件下的尺肱关节间隙。
结果
在对照条件下，投球60次后的尺肱关节间隙显著大于投球前（P < .01）。相比之下，在戴肘部护具的条件下，重复投球后尺肱关节间隙无显著差异。比较这两种条件时，投球60次后，对照条件下的尺肱关节间隙显著大于戴肘部护具条件下的尺肱关节间隙（P < .01）。
结论
通过在重力负荷下测量尺肱关节间隙，超声测定结果表明，肘部护具具有防止重复性投掷导致内侧肘关节间隙增大的作用。
临床意义
在棒球投球练习中佩戴肘部护具，可能有助于通过减少内侧肘关节间隙来降低肘部的机械应力。
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