Not an expert, so no substitute for your surgeon, but that is definitely what sciatica feels like. I've had it twice. Mine was probably -- they never found the source on a diagnostic -- from a small part of the hip called the periformis, which when inflamed often hits the sciatic nerve. But it can also come from a problem with the hip, although this does sound more like sciatica, or from the lower back. Any inflammation that hits the sciatic nerve enough can cause it. If inflammation from the surgery caused it, which is very possible, one would hope that inflammation would eventually go away, but inflammation in joint areas or core muscles can often be very stubborn and in that case physical therapy exercises should help assuming the surgeon didn't mess up and hit something he shouldn't have, which is extremely common. Can't say what it is, but having had it, can say what the possibilities might be for discussion with your surgeon. If you don't get good answers, see a different surgeon. Peace.