Why does my butt hurt after a total knee replacement?

Butt attached to leg. You have likely been compensating for your knee prior to your surgery. This can throw your pelvis off but you don't notice it because it works. Now that your knee is fixed, you're likely walking more normally so you notice that your pelvis is off and your butt hurts. A good do can apply some omm to re-right your pelvis and help alleviate some of the pain.
Several possibilitie. A low back strain or disc herniation can cause sciatica symptoms with pain in the butt. Straight leg raises during rehab can cause this. A hamstring origin muscle strain can do this. From impacting the femoral component onto the end of the femur you can get a femoral neck stress fracture. A hip abductor strain or trochanteric bursitis can develop from a irregular gait pattern right after surgery.
Hip arthritis? Knee pain may be in part referred from the hip, now they the knee is fixed you may be feeling your hip arthritis which not commonly is felt in the buttock behind the knee if the arthritic part is more posterior. Check with your doctor and have your hip checked, if the hip is ok, then adjustment of the pelvis may be needed!

Related Questions

What do I do about pain after a total knee replacement?

TKA pain. Usually less with spinal and femoral nerve blocks, ice, joint injection of pain cocktail intraop, postop narcotics. Read more...
Work with surgeon. Pain after total knee replacement varies from patient to patient. Most orthopaedic surgeons use a "multimodality" pain management approach, using different types of medications, not just narcotics, to help with pain control. Remember that ice is an important tool for pain management. Read more...

What can be expected after a total knee replacement for pt?

TKR Physical therapy. http://www.brighamandwomens.org/patients_visitors/pcs/rehabilitationservices/physical%20therapy%20standards%20of%20care%20and%20protocols/knee%20-%20tkr%20protocol.pdf. Read more...
Physical therapy. Physical therapy is an integral part of the total knee replacement process. Many orthopaedic surgeons will start pt prior to surgery ("pre-hab"). Therapy is usually started immediately after surgery in the hospital. Upon discharge from the hospital, pt is usually done 3x/week for 4-12 weeks, depending on the rate of the patient's recovery. Read more...