In this Monday, Aug. 20, 2012 photo, Marine Sgt. Ron Strang flexes the leg that was injured in a bomb blast in Afghanistan as he walks down a hill to a small park near his home in Jefferson Hills, Pa., just south of Pittsburgh. He lost half of his thigh muscle and has had it strengthened with an experimental implant of connective tissue developed from pigs. "It's been a huge improvement," he says. He is taking part in a study at University of Pittsburgh Medical Center. (AP Photo/Keith Srakocic)

Associated Press
In this Monday, Aug. 20, 2012 photo, Marine Sgt. Ron Strang flexes the leg that was injured in a bomb blast in Afghanistan as he walks down a hill to a small park near his home in Jefferson Hills, Pa., just south of Pittsburgh. He lost half of his thigh muscle and has had it strengthened with an experimental implant of connective tissue developed from pigs. "It's been a huge improvement," he says. He is taking part in a study at University of Pittsburgh Medical Center. (AP Photo/Keith Srakocic)
In this Monday, Aug. 20, 2012 photo, Marine Sgt. Ron Strang flexes the leg that was injured in a bomb blast in Afghanistan as he walks down a hill to a small park near his home in Jefferson Hills, Pa., just south of Pittsburgh. He lost half of his thigh muscle and has had it strengthened with an experimental implant of connective tissue developed from pigs. "It's been a huge improvement," he says. He is taking part in a study at University of Pittsburgh Medical Center. (AP Photo/Keith Srakocic)
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