Evaluation of the thickness of the medial ulnar collateral ligament in junior high and high school baseball players

Hideaki Nagamoto, Nobuyuki Yamamoto, Daisuke Kurokawa, Hiroyuki Takahashi, Takayuki Muraki, Minoru Tanaka, Yoichi Koike, Hirotaka Sano, Eiji Itoi

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

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. 4.4 mm), 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.

Original languageEnglish
Pages (from-to)395-400
Number of pages6
JournalJournal of Medical Ultrasonics
Volume42
Issue number3
DOIs
Publication statusPublished - 2015 Dec 19

Keywords

  • Asymptomatic
  • Elbow
  • Medial ulnar collateral ligament
  • Ultrasonography
  • Valgus stress
  • Youth baseball players

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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