Figure 6.

Locations and distance of the needles under finite element analysis.

(A) Both electrical needles were placed proximal to the nerve injury site. The black arrows represent needle electrodes, the black segment represents the nerve, and the red segment represents the injury site. (B) One electrical needle is placed proximal to the injury site and the other distal. (C) Current density and action function ratios at different locations. (D) Current density ratio at different needle distances. (E) Active function ratio at different needle distances.