If you’ve had a total knee replacement and your surgeon is recommending a manipulation under anesthesia (MUA), here’s a simple explanation of what it is — and what most people can expect in the 48 hours afterward. . A manipulation under anesthesia is a short procedure performed when a knee becomes “stiff” after a total knee replacement. Instead of making a new incision or doing additional surgery, your surgeon gently bends and straightens the knee while you’re under anesthesia. The goal is to br