We usually think of personal injury lawsuits as coming to fruition based on accidents or behavior that the victim could not have predicted. However, there are times where violent or dangerous sports – where you know you will be injured – can create personal injury lawsuits. Usually, what you cannot sue for are injuries that you knew you were going to get. This means like head injuries in boxing, and so on.
When you participate in certain sports or activities that you know have some degree of risk, yet you engage in them anyway, you are said to be taking the “assumption of risk”.
Certain entities and organizations will go even further, to have you sign a waiver understanding this before you can engage in their activity. This means that if you are injured in that activity, they will have a defense which protects them from liability to you.