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Bionic limb replacement: an evolving concept in lower extremity reconstruction

Limb loss is disabling and carries significant functional and psychological repercussions to both the individual and society. The numbers of amputees are forecasted to double by 2050 from vascular disease and diabetes alone. Europe has 4.66 million amputees (431,000 amputations per year) and the United States 2 million amputees (185,000 amputations per year). Microvascular expertise is now more commonplace, increasing the likelihood of limb salvage and replantation. Further reconstructive input can take advantage of nerve and tendon grafting/transfers, free tissue transfer, and complex bone reconstruction. When this strategy does not satisfy individual needs, such as that seen with unstable soft tissues, amputation may be requested or offered. In part, the decision for salvage, replantation, or amputation in the future is likely to be guided by the sophistication of limb substitutes. This review will introduce the growing domain of bionics and where research in this area may deliver a sought clinical need.