17 days isn't very long after a TKR. Hopefully you are doing the exercises 3x daily that were provided by a PT.

One thing to note, a tourniquet is placed around the thigh during surgery to slow blood flow to the knee. My inner thigh turned red after 2 or 3 days from bruising from the tourniquet. This is normal and should not be painful.

Not so sure about the ankle pain. It may just be due to the fact that your walking gait is affected from the TKR. Do the exercises no matter what and things should start to get a little better everyday, as ezas has noted.

All the best!