Role of Parecoxib Sodium in the Multimodal Analgesia after Total Knee Arthroplasty: A Randomized Double-blinded Controlled Trial.

Objective: Total knee arthroplasty (TKA) is an established surgical technique and is the standard treatment for degenerative knee joint diseases. However, severe pain after TKA makes it difficult for many patients to perform early postoperative rehabilitation and functional exercise, which might result in subsequent unsatisfactory recovery of knee joint function and great reduction in patients' satisfaction and quality of life. Orthopaedic surgeons have tried a large variety of analgesics and analgesic modes to relieve patients' pain after TKA. There are many analgesic regimens available in clinical practice but all have some deficiencies. Parecoxib sodium, a highly selective inhibitor of cyclooxygenase-2 (COX-2), can reduce the synthesis of peripheral prostaglandin to exert the effect of analgesia, and relieve inflammation and prevent central sensitization through inhibition of peripheral and central COX-2 expression. In addition, it can be used as a preemptive analgesic without affecting platelet aggregation. However, there does seem to be conflicting evidence in the current research as to whether parecoxib sodium can be used successfully as a preemptive analgesic; the effect of preemptive analgesia with parecoxib sodium in multimodal analgesia is still controversial. This research investigated the effects of parecoxib sodium in a preemptive multimodal analgesic regimen.

Methods: Eighty-eight patients were randomized into two groups. The experimental group received parecoxib (46 patients) and the control group received saline (42 patients), administered 30 min before the initiation of the surgical procedure. A patient-controlled analgesia (PCA) pump was applied within 48 h after surgery. The visual analogue scale (VAS), drug consumption through the PCA pump, use of salvaging analgesia, range of motion (ROM) of the knee joints, and postoperative complications were observed.

Results: The VAS score in the post-anesthesia care unit (PACU) of the parecoxib group was significantly lower than that of the control group (P = 0.039). There was no significant difference in the demographic profiles, duration of operation, hemorrhage in surgery, postoperative hemorrhage, postoperative drainage, VAS at different time points, function of knee joints, length of hospital stay, use of salvaging analgesia, and postoperative drug consumption through the PCA between the two groups (P > 0.05).

Conclusion: In preemptive multimodal analgesia regimens, parecoxib sodium can significantly decrease the VAS score in the short term, relieve pain shortly after surgery, and does not increase the incidence of complications. Parecoxib sodium is a safe and effective drug in the perioperative analgesic management for TKA.