Science Daily : “Since Sept. 11, 2001, an estimated 60,000 US military service members have been injured in combat during the Afghanistan and Iraq wars. Nearly 45,000 (75 percent) of all combat injuries are caused by improvised explosive devices, also known as IEDs. Approximately two out of five service members with combat injuries (40 percent) have suffered fractures, traumatic amputations, and injuries to the spine.”  

More here from the American Academy of Orthopedic Surgeons .