Prediction Model of Acute Postoperative Pain in Bilateral Total Knee Replacement Arthroplasty Patient

Prediction Model of Acute Postoperative Pain in Bilateral Total Knee Replacement Arthroplasty Patient: Multivariable Model Including "Surgical History Within 2 Weeks" as a Predictive Factor

This study aims to predict risk factors of acute postoperative pain of the patients undergoing Total Knee Replacement Arthroplasty(TKRA).

Patients undergoing bilateral TKRA are recruited. The time interval between the surgery of each leg is within 2 weeks. Before each surgery, patients will be asked to conduct questionnaires of Hospital Anxiety and Depression Scale(HADS) and Pain Catastrophizing Scale(PCS). In addition, the patients will have their preoperative knee pain(measured by Knee injury and Osteoarthritis Outcome Score), preoperative pain in other sites, expectation of postoperative pain(measured by Numerical Rating Scale), and morbidity of diabetic neuropathy recorded. Demographic factors including age, sex, and BMI of patients will be collected. Twenty four and forty eight hours after completion of the surgery, each patient will be asked to report thier acute postoperative pain on Numerical Rating Scale.

This study aims to find out risk factors of acute postoperative pain, including identical surgical history within 2 weeks, in patients undergoing bilateral TKRA.

Inclusion Criteria:

• 1) patients undergoing bilateral TKRA with spinal anesthesia
• 2) patients who have their second TKRA in one leg within 2 weeks after their first TKRA in the other leg.
• 3) patients who are classified to the state of ASA physical status classification system Ⅰ,Ⅱ, or Ⅲ.

Exclusion Criteria:

• 1) patients incapable of communication