caa a22 4500 605539626 CHVBK 20210128100907.0 cr unu---uuuuu 210128e20150701xx s 000 0 eng 10.1007/s10396-014-0605-1 doi (NATIONALLICENCE)springer-10.1007/s10396-014-0605-1 Evaluation of the thickness of the medial ulnar collateral ligament in junior high and high school baseball players [Elektronische Daten] [Hideaki Nagamoto, Nobuyuki Yamamoto, Daisuke Kurokawa, Hiroyuki Takahashi, Takayuki Muraki, Minoru Tanaka, Yoichi Koike, Hirotaka Sano, Eiji Itoi] Background: Thickening of the medial ulnar collateral ligament in the throwing arm of adult baseball players is a well-known phenomenon. However, onset of the thickening is unclear among young baseball players. The purpose of this study was to evaluate the thickness of the medial ulnar collateral ligament in junior high and high school baseball players. Subjects and methods: Seventy-one uninjured and asymptomatic junior high and high school baseball players were included in the study. Participants underwent physical examination after completing a questionnaire, followed by ultrasonographic evaluation. The thickness of the medial ulnar collateral ligament was measured bilaterally. The thickness of the throwing and non-throwing sides in high school and junior high school baseball players, and within each group, was compared and statistically analyzed. Results: The medial ulnar collateral ligament in the throwing arm of high school baseball players was thicker than that in the non-throwing arm (5.5 vs. 4.4mm), although no significant difference was seen in junior high school baseball players. High school baseball players showed a significantly thicker medial ulnar collateral ligament in the throwing arm than junior high school baseball players. Conclusion: Thickening of the medial ulnar collateral ligament in the throwing arm of asymptomatic and uninjured baseball players may begin by the time the players reach high school. The Japan Society of Ultrasonics in Medicine, 2014 Ultrasonography nationallicence Elbow nationallicence Medial ulnar collateral ligament nationallicence Youth baseball players nationallicence Valgus stress nationallicence Asymptomatic nationallicence Nagamoto Hideaki Department of Orthopaedic Surgery, Tohoku University School of Medicine, 1-1 Seiryo-machi, Aobaku, 980-8574, Sendai, Japan aut Yamamoto Nobuyuki Department of Orthopaedic Surgery, Tohoku University School of Medicine, 1-1 Seiryo-machi, Aobaku, 980-8574, Sendai, Japan aut Kurokawa Daisuke Department of Orthopaedic Surgery, Sendai Medical Center, Sendai, Japan aut Takahashi Hiroyuki Department of Orthopaedic Surgery, Kesennuma City Hospital, Kesennuma, Japan aut Muraki Takayuki Department of Physical Medicine and Rehabilitation, Tohoku University School of Medicine, Sendai, Japan aut Tanaka Minoru Department of Orthopaedic Surgery, Tohoku Rosai Hospital, Sendai, Japan aut Koike Yoichi Department of Orthopaedic Surgery, Japan Red Cross Sendai Hospital, Sendai, Japan aut Sano Hirotaka Department of Orthopaedic Surgery, Sendai City Hospital, Sendai, Japan aut Itoi Eiji Department of Orthopaedic Surgery, Tohoku University School of Medicine, 1-1 Seiryo-machi, Aobaku, 980-8574, Sendai, Japan aut Journal of Medical Ultrasonics Springer Japan 42/3(2015-07-01), 395-400 1346-4523 42:3<395 2015 42 10396 https://doi.org/10.1007/s10396-014-0605-1 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10396-014-0605-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Nagamoto Hideaki Department of Orthopaedic Surgery, Tohoku University School of Medicine, 1-1 Seiryo-machi, Aobaku, 980-8574, Sendai, Japan aut NATIONALLICENCE 700 1- Yamamoto Nobuyuki Department of Orthopaedic Surgery, Tohoku University School of Medicine, 1-1 Seiryo-machi, Aobaku, 980-8574, Sendai, Japan aut NATIONALLICENCE 700 1- Kurokawa Daisuke Department of Orthopaedic Surgery, Sendai Medical Center, Sendai, Japan aut NATIONALLICENCE 700 1- Takahashi Hiroyuki Department of Orthopaedic Surgery, Kesennuma City Hospital, Kesennuma, Japan aut NATIONALLICENCE 700 1- Muraki Takayuki Department of Physical Medicine and Rehabilitation, Tohoku University School of Medicine, Sendai, Japan aut NATIONALLICENCE 700 1- Tanaka Minoru Department of Orthopaedic Surgery, Tohoku Rosai Hospital, Sendai, Japan aut NATIONALLICENCE 700 1- Koike Yoichi Department of Orthopaedic Surgery, Japan Red Cross Sendai Hospital, Sendai, Japan aut NATIONALLICENCE 700 1- Sano Hirotaka Department of Orthopaedic Surgery, Sendai City Hospital, Sendai, Japan aut NATIONALLICENCE 700 1- Itoi Eiji Department of Orthopaedic Surgery, Tohoku University School of Medicine, 1-1 Seiryo-machi, Aobaku, 980-8574, Sendai, Japan aut NATIONALLICENCE 773 0- Journal of Medical Ultrasonics Springer Japan 42/3(2015-07-01), 395-400 1346-4523 42:3<395 2015 42 10396