He has a Taxus stent and has been on Plavix since implantation.
Although Plavix and other antiplatelet drugs increase bleeding risk, they have minimal if any efficacy against venous (as opposed to arterial) thrombosis, which is the main short-term worry following orthopedic surgery.
p.s. Tough luck for your friend: He not only had an accident, but also is stuck with a third-rate stent :- ( :- )