The clinical nature of sport-related concussion is discussed in this paper. Particularly highlighted are the difficulties with definition, injury severity grading, classification, and understanding of clinical symptoms. In addition, the well-recognized sequelae of concussion including the motor and convulsive manifestations are discussed in detail. Where possible, an evidence-based approach is adopted to assist the understanding of the literature in this complex area.
*Department of Neurosurgery, McGill University, Montreal, Quebec, Canada; †Centre for Sports Medicine Research & Education, and Brain Research Institute, University of Melbourne, Melbourne, Victoria, Australia; and ‡University of Calgary, Sport Medicine Centre, Calgary, Alberta, Canada
Address correspondence to Paul McCrory, mbbs, PhD , 31 Grosvenor Parade, Balwyn, Victoria 3101, Australia. E-mail: pmccrory@ compuserve.com