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Abnormal Levels of a Protein Linked to C.T.E. Found in N.F.L Players’ Brains, Study Shows

If You Tear a Knee Ligament, Arthritis Is Likely to Follow in 10 Years

Cost of Contact in Sports Is Estimated at Over 600,000 Injuries a Year

Yes, Aaron Hernandez Suffered Brain Injury. But That May Not Explain His Violence.

The Earliest Signs of Brain Damage in Athletes? Listen for Them