Shannon Smith developed sepsis and a clot-causing condition that led to the amputation of all four of her limbs almost a year ago. She became one of the first people to receive four prostheses that work through nerve activation, allowing her to go from using a wheelchair to being able to walk on her own. Microprocessors in her artificial knees monitor her gait, said East Coast Orthotic & Prosthetic clinical director Christopher Berger.

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