Unlike the previous two procedures, which are only done in people with stress urinary incontinence, sacral nerve stimulation (SNS) is used to correct problems related to overactive bladder, urge urinary incontinence and urinary retention. A small device is surgically implanted next to the sacral nerve in the lower back, which plays a critical role in bladder emptying. By stimulating the nerve with electrical current, SNS restores the signalling pathways that are needed for the bladder to work properly. The procedure is reversible, meaning that the device can be removed at any time. Unfortunately, there are very few hospitals in Canada equipped to perform this procedure.