A punch drunk jockey?

@article{Mccrory2004APD,
  title={A punch drunk jockey?},
  author={Paul Mccrory and Mary Turner and Judith Hudson Murray},
  journal={British journal of sports medicine},
  year={2004},
  volume={38 3},
  pages={e3}
}
The case is reported of a retired professional jockey with progressive memory loss. The concern is that he may be suffering from chronic traumatic encephalopathy or the "punch drunk syndrome".