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Hamstring injury patterns in professional male football (soccer): a systematic video analysis of 52 cases
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  • Published on:
    Is time loss a good indicator of hamstring injury severity in professional male football (soccer) players?
    • Chin-Hsien Wu, Orthopaedist E-Da Hospital
    • Other Contributors:
      • Cheng-Yo Yen, Orthopaedist
      • Cheng Liu, Healthcare administrator
      • Songyan Wang, Professor, Football Academy
      • Cheuk-Kwan Sun, Trauma surgeon

    Dear Editor,

    We read with great interest the article by Gronwald et al. that investigated the injury inciting events of moderate and severe acute hamstring injuries in professional male football (soccer) players with systematic video analysis.1 Despite the pain-taking reviewing of videos and motion analyses by the authors, there are still some practical concerns over injury severity and subject recruitment.

    Taking into account the importance of injury severity assessment that served as the basis for study subject enrollment in that study, the use of time loss to represent the severity of injury may not be optimal when considering other factors that may contribute to a prolonged rest after injury. For instance, pre-existing hamstring conditions including hamstring strings, proximal hamstring tendinopathy, or referred posterior thigh pain are not uncommon among soccer players.2 Following this argument, the recruitment of study subjects based on club or physician registration without meeting more objective criteria and without excluding those with previous hamstring injuries through a medical record review may introduce bias regarding the determination of injury severity. In this aspect, magnetic resonance imaging (MRI), which was available in 87% (45 out of 52 cases for pattern hamstring injury categorisation), may be a more reliable tool for evaluation because of its ability to show the extent of injury and the reported correlation between the size of injury a...

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    Conflict of Interest:
    None declared.