1) Comparative Negligence - This is where the defendant places part, or all, of the blame for the injury on the injured. Basically, the rule in Oklahoma is that a plaintiff may not recover if his/her negligence is greater than the negligence of the defendant(s).
The exact language in the Oklahoma Statutes is:
In all actions hereafter brought, whether arising before or after the effective date of this act, for negligence resulting in personal injuries or wrongful death, or injury to property, contributory negligence shall not bar a recovery, unless any negligence of the person so injured, damaged or killed, is of greater degree than any negligence of the person, firm or corporation causing such damage, or unless any negligence of the person so injured, damaged or killed, is of greater degree than the combined negligence of any persons, firms or corporations causing such damage. [Emphasis added]. See: 12 O.S. ยง 132) Assumption of Risk - This can bar recovery for the plaintiff. This occurs when the plaintiff has expressly or impliedly assumed the risk. Risky activities are generally associated with this.