Establishment and validation of a nomogram predicting the risk of deep vein thrombosis before total knee arthroplasty.

"Declarations Consent for publicationNot applicable. Competing interestsThe authors declare no competing interests. Ethics approvalThis study was approved by the Ethics Committee of the Second Hospital of Shanxi Medical University. In addition to this, we confirm that all methods were performed in accordance with the relevant guidelines and regulations. This study was a retrospective study; therefore, we did not have to ask patients to sign an informed consent form. About “Medical Research Exemption from Informed Consent Application Form” was approved by the Ethics Committee of the Second Hospital of Shanxi Medical University. Competing interests The authors declare no competing interests."

"Funding This work was supported by the National Natural Science Foundation of China (No. 81972075)."