a friend , 81, unfortunately went in for a knee replacement but due to extremely poor lower leg circulation the leg ended up being amputated above the knee after the knee replacement. that next week after another surgery to implant a drain tube in his lower abdomen, his testicles, scrotum and penis swelled as well as turned deep purple. it was very painful to move his leg and stump on top of all the other things going on. any ideas why this byproduct happened? it has been 3 months and says something else is going on for the same area but wouldn't give me any details. he asked me today if i remembered his discomfort from the hospital stays so I thought I'd dig into possibilities for him.