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Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
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Tsuyoshi TAJIKA 1, Tsutomu KOBAYASHI 2, Atsushi YAMAMOTO 1, Hitoshi SHITARA 1, Tsuyoshi ICHINOSE 1, Daisuke SHIMOYAMA 3, Noboru OYA 1, Tsuyoshi SASAKI 1, Kenji TAKAGISHI 1
1 Department of Orthopaedic Surgery, Gunma University Graduate School of Medicine, Gunma, Japan; 2 Department of Physical Therapy, Takasaki University of Health and Welfare, Gunma, Japan; 3 Department of Orthopaedic Surgery, National Hospital Organization Takasaki General Medical Center
BACKGROUND: There are few literatures describing the association between glenohumeral internal rotation deficits (GIRD) and valgus laxity of the elbow on the throwing side of high school pitchers with and without a history of elbow symptom.
METHODS: The passive range of motion of glenohumeral internal and external rotation on bilateral side shoulders was measured in 75 highschool baseball pitchers during the preseason. Using ultrasonography, the width of the ulnohumeral joint of the elbow was measured at 30° of flexion, both at rest and with valgus stress in the pitching side. Comparisons of glenohumeral internal rotation deficits and the difference between the width of ulnohumeral joint space with and without valgus stress on the throwing side were made between 75 highschool pitchers with and without a history of elbow symptom.
RESULTS: Participants with a history of elbow symptom exhibited a greater difference between the width of ulnohumeral joint with and without valgus stress in the throwing side than participants with no history of elbow symptom (P<0.05). No difference in glenohumeral internal rotation deficits was found in participants with and without a history of elbow symptom. In all participants, significant association was found between glenohumeral internal rotation deficits on the pitching side and the difference from the width of the ulnohumeral joint with and without valgus stress (P=0.04, r=0.23).
CONCLUSIONS: Elbow valgus instability was associated with elbow joint pain in high school pitchers. Although GIRD was not significantly different between the two groups, GIRD and elbow valgus instability might be related to the throwing side in highschool pitchers.