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Teenage knee injury 4X increase in last decade in Philadelphia – Oct 2011

Knee injuries on the rise in child and adolescent athletes

Clipped from Medical Express

"Knee Injuries In Children and Adolescents: Has There Been An Increase In ACL and Meniscus Tears In Recent Years?"

American Academy of Pediatrics Oct 16, 2011 presentation

Researchers at the Children's Hospital of Philadelphia noted a more than 400 percent increase in these injuries at their institution over the last decade


Suspect slower muscle reaction time due to low vitamin D levels

See also VitaminDWiki

Chart from ency editor Feldman 2005. Shows that those with slow muscle twitch are able to speed up response by taking vitamin D supplements.  PROOF