I'm cataloging the progress of my numb area so you can see how it progresses. To start with, the reason for this numb area is simple. A nerve called the saphenous that comes down the inside of the thigh and on into the calf. It has a small branch called the infrapatellar branch that goes across the front of the knee and provides sensory input from the skin in that area. You can see it here As you can see, it's in the path of the incision so cannot avoid being cut. I had my knee replaced on March 17th 09 and this is the progress of my numb area thus far. I shall be updating it as time goes on. at 9 weeks at 5 months it has reduced by about 30% This is on the 9 month anniversary When tracing the outline of the numb area this time, I was delighted to discover a patch in the centre, the hatched area, that seems to be regaining sensation! It's not quite there yet and it mostly feels like intense pins and needles though only when I touch, rub or knock it! I've been experimenting with trying to kneel and that was when I first noticed it. So pins and needles really do indicate the return of nerve healing! Woopeee! 10 months Interestingly, the blue hatched area has developed which is a patch of intense pins and needles when I press on it, lean against something or try to kneel down! Other than that, the area seems to be decreasing nicely. Update August 2011: Seems I was a tad over optimistic then! As of this date, no further progress on my numb patch and it very much looks like mine is going to be PERMANENT!! Another update June 2013: sure is permanent!