Risk factors for shoulder injuries with or without past history in collegiate rugby players

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  • Ogaki Ryo
    Center for Humanity and Science, Ibaraki Prefectural University of Health Science Graduate School of Comprehensive Human Sciences, University of Tsukuba
  • Takemura Masahiro
    Faculty of Health and Sport Science, University of Tsukuba
  • Iwai Koichi
    Center for Humanity and Science, Ibaraki Prefectural University of Health Science
  • Miyamoto Yoshiaki
    Graduate School of Comprehensive Human Sciences, University of Tsukuba
  • Imoo Yoshiyuki
    Department of Rehabilitation, Mito Kyodo General Hospital
  • Nagai Satoshi
    Graduate School of Comprehensive Human Sciences, University of Tsukuba Tsukuba International University
  • Miyakawa Shumpei
    Faculty of Health and Sport Science, University of Tsukuba

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Other Title
  • 大学ラグビー選手における肩関節外傷の初回受傷及び再受傷の危険因子
  • ダイガク ラグビー センシュ ニ オケル カタカンセツ ガイショウ ノ ショカイジュショウ オヨビ サイジュショウ ノ キケン インシ

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Abstract

To examine risk factors for shoulder injuries with or without history of the injuries using the stratification analysis for collegiate rugby players. 71 elite rugby players from one university rugby club joined in the preseason medical screening related to their shoulder joints, including basic demographics, history of injuries, and physical findings at that time. Subsequently, the occurrence of shoulder injuries was recorded during four playing seasons. Analysis was stratified with or without history of the injuries; player without the past history of injury, 47 players; player with the past history of injury, 24 players. As a result of all players with the past history, 13 players sustained the shoulder injuries. Internal rotational range of motion [IR ROM] (OR, 1.5; 95%CI, 1.13-1.96; p=0.004), external rotational range of motion [ER ROM] (OR, 1.9; 95%CI, 1.21-2.87; p=0.005), horizontal flexion range of motion [HF ROM] (OR, 1.3; 95%CI, 1.03-1.64; p=0.025), IR muscle strength (OR, 0.4; 95%CI, 0.20-0.65; p=0.001) and rugby experience (OR, 1.2; 95%CI, 1.02-1.46; p=0.032) were associated with the shoulder injuries. On the other hand, 10 players sustained injuries of the players without the past history of injury. IR muscle strength (OR, 0.3; 95%CI, 0.11-0.72; p=0.008) and rugby experience (OR, 1.4; 95%CI, 1.11-1.66; p=0.003) were associated with the shoulder injuries. This study clearly showed that IR, ER, HF ROM, IR muscle strength and rugby experience were important initial risk factors for shoulder injuries. Moreover, IR muscle strength and rugby experience were important recurrence risk factors for shoulder injuries.

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