New developments in lower limb prosthetics that mimic the human body have dramatically improved the life of retired Marine William Gadsby, who was wounded by an IED and sniper's bullet in Iraq that ultimately claimed his right leg. (Courtesy of William Gadsby)

One of the hardest things for lower limb amputees to do is to pick up their leg and prosthetic and step over an obstacle or object. Here, retired Marine William Gadsby shows how easy it is using his X2 microprocessor knee and BiOM ankle. (Courtesy of William Gadsby)

New developments in lower limb prosthetics that mimic the human body have dramatically improved the life of retired Marine William Gadsby, who was wounded by an IED and sniper's bullet in Iraq that ultimately claimed his right leg. Here, Gadsby wears his X2 microprocessor knee from Ottobock and BiOM ankle, developed by iWalk. When used together, Gadsby can walk with a natural gait like the uninjured, without pain and fatigue, and has resumed his active lifestyle. Gadsby can now hike mountain trails and walk naturally on sand dunes, something that has allowed for exercise and greatly improved his mental well-being. (Courtesy of William Gadsby)

Retired Marine William Gadsby climbs a wall carrying a heavy pack, showing off his X2 microprocessor knee from Ottobock and BiOM ankle. (Courtesy of Richmond VA Medical)

Retired Marine William Gadsby carries a chair over his head to show off his X2 microprocessor knee from Ottobock and BiOM ankle, developed by iWalk. When used together, Gadsby can walk without pain and fatigue with a natural gait like the uninjured. (Courtesy of Richmond VA Medical)

Retired Marine William Gadsby says that prosthetics have dramatically improved his mental well-being and life, and have allowed him to resume a highly active life. (Courtesy of Richmond VA Medical)

Gadsby wears his X2 microprocessor knee from Ottobock and BiOM ankle, developed by iWalk. When used together, Gadsby can walk with a natural gait like the uninjured, without pain and fatigue, and has resumed his active lifestyle. Gadsby can now hike mountain trails and walk naturally on sand dunes, something that has allowed for exercise and greatly improved his mental well-being. (Courtesy of William Gadsby)

Thanks to his X2 microprocessor knee from Ottobock and BiOM ankle, developed by iWalk, retired Marine William Gadsby can walk with a natural gait like the uninjured, without pain and fatigue. (Courtesy of Richmond VA Medical)

Retired Marine William Gadsby shows off his X2 microprocessor knee from Ottobock and BiOM ankle, developed by iWalk. When used together, Gadsby can walk with a natural gait like the uninjured, without pain and fatigue. (Courtesy of Richmond VA Medical)