Patients and study design
knee arthroplasty, VTE
A total of 230 patients undergoing hip and knee arthroplasty between March 2021 and March 2022 in orthopaedic departments of four major teaching hospitals, including the First Medical Center of Chinese PLA General Hospital, the Fourth Medical Center of Chinese PLA General Hospital, Hainan Hospital of Chinese PLA General Hospital, and the First Affiliated Hospital of Suzhou University, were prospectively enrolled. The inclusion criteria were as follows: (1) patients receiving hip and/or knee arthroplasty, (2) aged ≥ 18 years, (3) had a Caprini score of ≥ 3 points [
A flowchart of patient enrolment processAll patients voluntarily participated in the study and written informed consent was obtained from each patient. This study was approved by the Medical Ethics Committee of Chinese PLA General Hospital (No. 2021-002-01) and the First Affiliated Hospital of Suzhou University (No. 2,021,053). We registered our study in the Chinese Clinical Trial Registry (02/01/2022) (ChiCTR2200055166). Data and materials are available upon reasonable request with the permission of the corresponding authors.According to the expert consensus on mechanical prevention of VTE in China, the longest recommended time was ≥ 18 h per day. A previous study pointed out that 6–9 h per day could also be effective in the prevention of VTE [