A commentary on "continuous adductor canal block is a better choice compared to single shot after primary total knee arthroplasty: A meta-analysis of randomized controlled trials" (Int J Surg 2019 Oct 12. pii: S1743-9191(19)30277-8. doi:10.1016/j.ijsu.2019.10.012. [Epub ahead of print]). (December 2019) - Chen, Chengyu; Liu, Junfeng