Brief history of patient: Fractured fibula & tibia in 2016, underwent surgery to have hardware to stabilize, then had hardware removed a few yrs later. His chief complaint is numbness where the post-surgical scar is on the fibular 3-4 inches superior to the lateral malleoli (where the ENS yellow and white leads are connects in the picture). My question: which frequency Hz is best for using the ENS? I know that low frequency is best for muscular contractions and high frequency for analgesic. 7.83 Hz is what I found researching online but wanted to check in here as well. TIA