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Impact of Muscle Graft Volume on Signaling Capacity in the Regenerative Peripheral Nerve Interface for Neuroprosthetic Control.

Regenerative Peripheral Nerve Interfaces (RPNIs) for high-fidelity control of neuroprostheses in amputees consist of a freely transferred muscle graft reinnervated by a residual nerve within the amputated limb. In previous RPNI surgeries, a small (~130 mg) graft of free skeletal muscle became quickly revascularized by collateral blood flow. 2,3 However, larger muscle grafts may increase electrical signaling capacity. Our purpose was to evaluate the effect on RPNI signaling capacity and tissue viability when a muscle graft with increasing muscle volume was implanted.