Selectivity is the degree to which part of a nerve could be stimulated without stimulating other nerve parts. For each participant who had successful MRI and CT images, a computational model was created to simulate electrical stimulation of axons distributed in two primary pudendal fascicles: perineal and rectal. The SI of stimulation does not indicate a positive or negative result in this outcome; rather, it shows the relative potential for activating just a single nerve fascicle. The negative/positive designation identifies the regional nerve activation, with -1 representing only perineal fascicle activation, +1 representing only rectal activation, and 0 indicating equal activation of both fascicles.

A secondary outcome measure was a goal to examine the effect of selective pudendal nerve stimulation on urethral leak point pressure during the cystometrogram.

Selectivity refers to the degree in which a nerve could be stimulated without stimulating other nerves. SI was calculated for each sensor recording from locations innervated by distal pudendal nerve branches during the visit-2 implant procedure. This includes pressure sensors in the urethra innervated by the perineal nerve and anal electromyography (EMG) innervated by the ischeal rectal nerve. The SI calculation used here is on a scale of 0 to 1, with 0 indicating no response at all from the nerve. The closer the number is to 1, the more selective the nerve stimulated.

Data was collected from 16 participants who received the implant.

Selectivity is the degree to which part of a nerve could be stimulated without stimulating other nerve parts. For each participant who had successful MRI and CT images, a computational model was created to simulate electrical stimulation of axons distributed in two primary pudendal fascicles: perineal and rectal. The SI of stimulation does not indicate a positive or negative result in this outcome; rather, it shows the relative potential for activating just a single nerve fascicle. The negative/positive designation identifies the regional nerve activation, with -1 representing only perineal fascicle activation, +1 representing only rectal activation, and 0 indicating equal activation of both fascicles.

Computational models were created for 10 participants who received the implant. The model data was segregated into three groups: participants with selectivity indices positive (>0) for all four contacts (rectal only), negative (<0) for all four contacts (perineal only), and mixed (both >0 and <0). Each group has the same potential range for SI values: -1 to +1. Values in the Outcome Measure Data Table are calculations across all lead contacts and participants per group.

A secondary outcome measure was a goal to examine the effect of selective pudendal nerve stimulation on urethral leak point pressure during the cystometrogram.

Selective pudendal nerve stimulation was not performed during the cystometrogram sessions due to time limitations within experimental sessions, so there is no data available. "Selectivity" could not be accomplished as it was described in the protocol for this nerve bundle.