An inverted ankle joint orientation at foot strike could incite ankle inversion sprain: Comparison between injury and non-injured cutting motions of a tennis player |
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| Institution: | 1. Department of Orthopaedics and Traumatology, Prince of Wales Hospital, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong;2. Office of Student Affairs, Lingnan University, Hong Kong;3. Department of Health and Physical Education, The Education University of Hong Kong, Hong Kong;4. Department of Biomedical Engineering, Faculty of Engineering, The Chinese University of Hong Kong, Hong Kong;5. Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hong Kong;6. Faculty of Kinesiology, University of Calgary, Canada;7. National Centre for Sport and Exercise Medicine, School of Sport, Exercise and Health Sciences, Loughborough University, Loughborough, UK;1. Department of Human Health Sciences, Kyoto University, Japan;2. Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, UK;3. Department of Rehabilitation Sciences, KU Leuven, Belgium;4. Biomechanics Laboratory, Penn State University, USA;1. School of Sport, Exercise, and Health Sciences, Loughborough University, Loughborough LE11 3TU, United Kingdom;2. Institute for Sports Research, Nanyang Technological University, Singapore;3. National Institute of Education, Nanyang Technological University, Singapore;1. School of Health Sciences, University of Salford, UK;2. Exeter Biomechanics Team, Sport and Health Sciences, University of Exeter, UK;3. Sports Engineering Research Group, University of Sheffield, Department of Mechanical Engineering, UK |
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| Abstract: | Ankle sprain is very common in sports. Research on its prevention is as important as on its treatment as recommended in the 2016 consensus statement of the International Ankle Consortium. Successful prevention depends on the understanding of its mechanism, which has been presented with quantities in some recent case reports. Inciting event was suggested to be an inverted ankle joint at foot strike, however, is still lacking evidence from comparison with non-injury trials. This study investigated the ankle joint orientation at foot strike in successful non-injury cases and compared them with a previously analysed ankle sprain injury case. Two injury-free cutting motions with similar movement approach to a previously analysed ankle sprain injury performed by the same athlete were collected from an online search and were trimmed from 0.05 s before until 0.30 s after the foot strike. The video sequences were then processed by video editing software and then analysed by a model-based image-matching motion analysis technique. Ankle joint orientation at foot strike and the profiles were presented in inversion, plantarflexion and rotation planes, for both the previously analysed injury case and the two non-injury cases. The ankle joint orientation at foot strike was 0–1 degree inverted and 10–21° dorsiflexed in the two non-injury cases, compared to 14° inverted and 16° plantarflexed in the previously analysed injury case. From the case comparison, it can be observed that an inverted ankle joint orientation at foot strike in an inciting event of ankle inversion sprain. |
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| Keywords: | Video analysis Injury mechanism Sports medicine Biomechanics Kinematics Health |
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