No they don't.
Snopes have covered this rumor already. Beyond the official McDonald's publication and advertising, Snopes also cites the Federal Trade Commission Act which has the power to:
prevent persons, partnerships, or corporations from using unfair methods of competition in or affecting commerce, and unfair or deceptive acts or practices in or affecting commerce.
Also citing the Lanham Act as having provisions that provide remedy for customers against corporations that have deceived them.
McDonald's have admitted that they used Pink Slime in their products and have announced that they will stop using it. (source: ABC news). Pink Slime can constitute up to 15 percent of ground beef without additional labeling in the USA (source: ABC news):
"It disturbs me that USDA made a decision that this filler, up to 15 percent doesn't have to be disclosed," she told ABC News. "Therefore the consumer is at the mercy of each retailer's decision."
In Israel, the patties for McDonald's are made by a company named Of Tov which literally translates as "Good Chicken", in their site they still say that their patties are made from 100% lean beef meat.