Postoperative Epidural Analgesia After Total Knee Arthroplasty With Sufentanil 1 μg/mL Combined With Ropivacaine 0.2%, Ropivacaine 0.125%, or Levobupivacaine 0.125%: A Randomized, Double-Blind Comparison
Postoperative Epidural Analgesia After Total Knee Arthroplasty With Sufentanil 1 μg/mL Combined With Ropivacaine 0.2%, Ropivacaine 0.125%, or Levobupivacaine 0.125%: A Randomized, Double-Blind Comparison