We read with great interest the article by Felipe Muñoz-Leyva et al. entitled “No Benefits of Adding Dexmedetomidine, Ketamine, Dexamethasone, and Nerve Blocks to an Established Multimodal Analgesic Regimen after Total Knee Arthroplasty” published in the July 2022 issue of Anesthesiology. We appreciate the authors’ great work. However, we also found two worthwhile issues that we would like to raise to the investigators.

First, the dosages of some analgesics were not fixed in perioperative management. For example, all patients were administered 650 to 1,000 mg acetaminophen and 100 to 200 mg celecoxib in the perioperative period, and 5 to 10 mg immediate-release oral oxycodone or 1 to 2 mg hydromorphone was supplemented after surgery. What was the dosing rationale, and were the administered amounts different between groups?

Second, the authors reported that the incidence of plantar flexion impairment on postoperative day 0 was 17.9% and 46.1% for control...

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