I had total hip replacement 9 18 2012 hip responding very well but my knee on the same leg is very bothersome mostly upon compression (walking) my pt ?

A few possibilities: A persistent hip problem can cause referred pain to the knee on the same side. You may be more active now that your hip is improved, unmasking what was a previously a lesser problem in your knee. The hip replacement could have slightly changed the alignment of of your limb, which could cause changed loading of your knee. You should talk to the orthopaedic surgeon who replaced your hip about thi.

Total hip: Check with your orthopedic surgeon for good exam of the knee--may have sprain/strain, meniscal issues from improved hip motion & alignment after total hip replacement. Usually improves.

Knee or hip: Knee pain could be from a knee problem unrelated to the hip surgery, or it can sometimes be seen as referred pain from the hip stem causing irritation in the femur. In that instance, it is usually temporary and should gradually go away. You should see your orthopedic surgeon for an evaluation to determine the source of the pain.