<b>Biomechanical analysis of acute subdural hematoma resulting from </b><b>judo </b>
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- HITOSUGI Masahito
- Department of Legal Medicine, Shiga University of Medical Science
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- MURAYAMA Haruo
- Department of Sports Science, Dokkyo Medical University School of Medicine,
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- MOTOZAWA Yasuki
- Department of Legal Medicine, Dokkyo Medical University School of Medicine,
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- ISHII Kanto
- Department of Legal Medicine, Dokkyo Medical University School of Medicine,
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- OGINO Masahiro
- Department of Neurosurgery, Dokkyo Medical University School of Medicine
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- KOYAMA Katsuhiro
- Department of Health Sciences, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi
Bibliographic Information
- Other Title
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- Biomechanical analysis of acute subdural hematoma resulting from judo
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Abstract
This study investigated biomechanical mechanisms of acute subdural hematoma caused by judo and sought preventive measures to reduce injury. A Japanese judo expert repeatedly threw an anthropometric test device using two throwing techniques, Osoto-gari and Ouchi-gari. Linear and angular accelerations of the head were measured. Both throwing techniques resulted in the dummy falling backwards, with the occipital area of the head contacting the mat, and peak linear and angular accelerations being observed when the head contacted the mat. For linear acceleration, the posterior–anterior direction showed the greatest force (41.0 ± 2.6 G using Osoto-gari, and 86.5 ±4.3 G using Ouchi-gari). For angular acceleration, values for sagittal plane rotation were greatest among the three directions measured (3315 ± 168 rad/s2 using Osoto-gari, and 1328 ± 201 rad/s2 using Ouchi-gari). We concluded that occipital head contact produced the most forceful longitudinal linear and sagittal plane angular accelerations; subsequent stretches and ruptures of parasagittal bridging veins resulting in acute subdural hematoma. As severe head injuries can result if a person’s head comes into contact with the mat, offensive throwing techniques should be restricted to participants able to sufficiently demonstrate the Ukemi technique.
Journal
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- Biomedical Research
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Biomedical Research 35 (5), 339-344, 2014
Biomedical Research Press