This ruling by the Third Circuit (the federal appeals court that covers Pennsylvania, New Jersey, Delaware, and the Virgin Islands) holds that student-athletes may sue for additional harm if a coach returns them to play after a suspected concussion.
You can read the decision here: http://www2.ca3.uscourts.gov/opinarch/162821p.pdf
News article here: http://blogs.edweek.org/edweek/school_law/2017/09/liability_for_student…
As the news article says: The 3rd Circuit panel, in its ruling this week, held that a coach at a public school may be held liable where the coach requires a player who shows signs of a concussion "to continue to be exposed to violent hits."
"We hold that an injured student-athlete participating in a contact sport has a constitutional right to be protected from further harm, and that a state actor violates this right when the injured student-athlete is required to be exposed to a risk of harm by continuing to practice or compete," U.S. Circuit Judge Thomas I. Vanaskie wrote for the panel.