Do Yourself a Favor — Buy a Raised Toilet Seat . After your total knee replacement, most patients tell me they can’t stop going to the bathroom. That’s because the hospital pumps you full of fluids during and after surgery, and your body needs time to normalize. . On one hand, that’s great — it forces you to get up and walk frequently, which helps circulation and prevents stiffness. . But on the other hand, it can be a nightmare if you’re struggling to sit down or stand up from the toilet every