Comparison of Three Kinds of Postoperative Analgesia After Total Knee Arthroplasty

Comparison of Three Kinds of Postoperative Analgesia After Total Knee Arthroplasty :a Randomized Clinical Trial

Postoperative pain after total knee arthroplasty (TKA) can be difficult to manage and may delay recovery. There are multimodal postoperative pain management after TKA, including intravenous opioids, epidural analgesia, peripheral nerve blocks or periarticular infiltration with local anesthetics. All of these treatments may lead to side effects such as nausea, headache, hypotension, urinary retention, partial motor block and infection of the knee. Therefore the investigators will compare three methods of postoperative analgesic after TKA by their efficiency and complication.

Inclusion Criteria:

1. Patients of American Association of anesthetists（ASA）Grade 1、2 or 3
2. Aged between 18 and 85 years
3. Undergoing elective total knee replacement

Exclusion Criteria:

1. Mental illness can not match
2. Nerve block, epidural anesthesia contraindicated
3. People who have Slow-type arrhythmias
4. History of chronic headaches and long-term use of analgesic drugs
5. People who were postoperative consciousness, language or hearing impaired