Raideur de hanche chez le lanceur de baseball professionnel - 21/11/19
Hip stiffness score has correlations with range of motion and muscle power of throwing shoulder in professional baseball pitchers
, Atsuyuki Inui, Hanako Nishimoto, Takashi Kurosawa, Kohei Yamaura, Shintaro Mukohara, Tomoya Yoshikawa, Takeshi Kokubu, Ryosuke KurodaRésumé |
Background |
During throwing, the force generated by the lower extremities is transferred through the core, shoulder, elbow, and ultimately, the hand before ball release via the kinetic chain. Therefore, an insufficient hip rotation range of motion (ROM) can arrest the throwing mechanics. Recently, we developed a new scoring system of hip stiffness (Hip Stiffness Score; HSS) for medical assessment of baseball players. In this study, we investigated the correlation between HSS and shoulder conditions in the baseball pitchers.
Materials and methods |
Twenty-seven professional baseball pitchers volunteered for this study. HSS to quantitatively evaluate hip stiffness includes 4 physiologic parameters, including 1 straight leg raising (SLR) test, 2 hip internal rotation (HIR), 3 adduction, and 4 heel buttock distance (HBD). Bilateral glenohumeral internal and external-rotation (IR and ER) ROM were also measured passively, and IR and ER strength of shoulder were assessed bilaterally. In the ultrasound assessments, all participants were scanned by using an Aplio™500 to assess the muscle thickness of supraspinatus (SSP) and infraspinatus (ISP).
Results |
HSS showed a mild positive correlation with total arc of motion (TAM), weak positive correlations with glenohumeral internal rotation deficit (GIRD) and glenohumeral external rotation gain (GERG), and weak negative correlations with IR and ER strength. Then, the participants were divided into 2 groups according to HSS; more than 3 points of HSS was regarded as a high HSS group (n=12), and less than 2 points as a low HSS group (n=15). The GERG in the high HSS group was significantly greater than that in the low HSS (p<0.05), and the ER strength in the high HSS group was significantly lower than that in the low HSS (p<0.05). There were no significant differences in the GIRD, IR strength, and the thickness of SSP and ISP, but the thickness of ISP in the high HSS group was lower than that in the low HSS (p=0.08).
Discussion |
HSS has some correlations with TAM, GIRD, GERG, IR and ER strength of shoulder. It is assumed that the insufficient hip ROMs could inhibit the kinetic chain in throwing motion. Furthermore, the pitchers with the higher HSS showed greater GERG and lower ER strength. The increase of GERG and decrease of ER strength were reported to lead to shoulder and elbow injuries. Therefore, it is possible that the HSS could be useful for the medical check-up of the pitchers.
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Vol 105 - N° 8S
P. S128 - décembre 2019 Retour au numéro
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