I recall reading that they can have concerns that glues/residues and lace materials which has/ had been exposed to sweat, could possibly harbour bacteria and cause an `issue` in the sterile environment of an operating theatre..... I think the best thing you can do is phone the main reception of the hospital and without revealing your personal details, just explain that you may have to undergo surgery there and ask what the general policy is. I can understand your concerns....best wishes with it.