J Sport Rehabil. 2021 Jan 19;30(5):786-793. doi: 10.1123/jsr.2020-0155.
Baseball pitching is a coordinated movement involving the spine. A previous study indicated that increased thoracic kyphosis angle in a standing position was a risk factor for medial elbow injuries in youth baseball players. However, spinal alignments in single-leg standing and their relationships with medial elbow injuries, scapular alignment, or hip joint range of motion are unclear.
To examine the difference in spinal alignment between standing and single-leg standing positions in youth baseball players and analyze their relationship with elbow injuries, scapular alignment, or hip joint range of motion.
Cross-sectional study.
University laboratory.
There were 51 youth baseball players with medial epicondylar fragmentation (medial elbow injury group) and 102 healthy youth baseball players (control group).
Thoracic kyphosis, lumbar lordosis, and trunk inclination angles during standing and single-leg standing, forward scapular posture, and hip joint range of motion.
In the single-leg standing position, the thoracic kyphosis and backward trunk inclination angles were significantly higher in the medial elbow injury group than in the control group (P = .016 and P = .046, respectively). In the standing position, no significant difference was observed between both groups. The thoracic kyphosis angle in single-leg standing was positively correlated with the bilateral forward scapular posture in the medial elbow injury (P = .008 and P < .001 on the throwing and nonthrowing sides, respectively) and control (P = .010 and P = .032 on the throwing and nonthrowing sides, respectively) groups.
High thoracic kyphosis and backward trunk inclination angles are characteristics during single-leg standing in youth baseball players with medial elbow injuries. Spinal alignment measurement in single-leg standing may be useful for identifying youth baseball players who are at risk for sustaining medial elbow injury.
棒球投球是一个涉及脊柱的协调运动。先前的研究表明，站立位胸腰椎后凸角度增加是青年棒球运动员内侧肘损伤的危险因素。然而，单腿站立时的脊柱排列及其与内侧肘损伤、肩胛骨排列或髋关节活动范围的关系尚不清楚。
检查青年棒球运动员单腿站立和站立位时脊柱排列的差异，并分析其与肘损伤、肩胛骨排列或髋关节活动范围的关系。
横断面研究。
大学实验室。
有 51 名患有内侧髁突碎片（内侧肘损伤组）的青年棒球运动员和 102 名健康的青年棒球运动员（对照组）。
站立位和单腿站立位时的胸椎后凸、腰椎前凸和躯干倾斜角、肩胛骨前突姿势和髋关节活动范围。
在单腿站立位时，内侧肘损伤组的胸椎后凸和躯干后倾角度明显高于对照组（P =.016 和 P =.046）。在站立位时，两组之间没有显著差异。单腿站立时的胸椎后凸角与内侧肘损伤组（投掷侧和非投掷侧分别为 P =.008 和 P <.001）和对照组（投掷侧和非投掷侧分别为 P =.010 和 P =.032）双侧肩胛骨前突姿势呈正相关。
内侧肘损伤的青年棒球运动员在单腿站立时具有较高的胸椎后凸和躯干后倾角度。单腿站立时的脊柱排列测量可能有助于识别易发生内侧肘损伤的青年棒球运动员。
