Pellegrini A, Tonino P, Paladini P, Cutti A, Ceccarelli F, Porcellini G
Unit of Shoulder and Elbow Surgery, Biomechanics Laboratory, D. Cervesi Hospital, Via Beethoven 46, Cattolica, Italy.
Musculoskelet Surg. 2013 Jun;97 Suppl 1:9-13. doi: 10.1007/s12306-013-0253-4. Epub 2013 Apr 18.
Throwing a baseball requires a coordinated sequence of scapula and humerus movements also called scapulo-humeral rhythm (SHR). Fatigue associated with repetitive throwing can lead to scapular dyskinesia, a recognized cause of shoulder disability in pitchers and overhead athletes. We introduce a novel device, the Xbus Kit, which can objectively assess scapular biomechanics and the effect of pitching on SHR.
SHR was studied using the Xbus Kit (Xsens Technologies B.V., NL). Thirteen collegiate baseball pitchers (aged 20 ± 2.6) were studied, evaluating SHR in forward elevation and abduction in three sessions: before throwing (S1), after 60 pitches (S2) and 24 h after a pitching session (S3).
SHR changes were found in 85 % of pitchers (11 cases), and no changes were observed in 2 cases (15 %). We were able to subdivide pitchers into four groups, based on their response to pitching.
Repetitive movement of pitching leads to SHR changes and sometimes, incomplete restoration of normal shoulder biomechanics.
投掷棒球需要肩胛骨和肱骨运动的协调序列，也称为肩肱节律（SHR）。与重复投掷相关的疲劳可导致肩胛骨运动障碍，这是投手和上肢运动员肩部残疾的一个公认原因。我们介绍一种新型设备，即Xbus套件，它可以客观地评估肩胛骨生物力学以及投球对肩肱节律的影响。
使用Xbus套件（荷兰Xsens Technologies B.V.公司）研究肩肱节律。研究了13名大学棒球投手（年龄20±2.6岁），在三个阶段评估前屈抬高和外展时的肩肱节律：投球前（S1）、投60次球后（S2）以及投球训练后24小时（S3）。
85%的投手（11例）出现肩肱节律变化，2例（15%）未观察到变化。根据投手对投球的反应，我们能够将他们分为四组。
重复投球运动导致肩肱节律变化，有时还会导致正常肩部生物力学无法完全恢复。
