I had left TKR 9 months ago. Recovery was going fine until 12 weeks when that knee developed numbness which makes the knee feel weak when walking and impairs my walking. My Ortho said it is caused by my back and not knee surgery. However, I have read in reputable sources that up to 10% of TKR can result in nerve damage. I do have spinal stenosis as well. An upcoming EMG will hopefully shed light on the source of the nerve involvement but the timing of this numbness seems a bit too coincidental to the knee surgery. I have no other knee pain and full flexion and extension. I, too, was not warned of this or any other possible complications. I certainly will ask more questions with any further surgeries.