All patients underwent color Doppler ultrasound screening for routine veins of both lower extremities before operation and on the first 1, 3, 7, and 14 days after operation. Tranexamic acid was routinely used during and after operation, and anticoagulation was routinely used after operation.
All patients were in the preoperative, postoperative 1, 3, 7, 14 days using color ultra-screening routine double lower limb veins, intraoperative, postoperative routine use of amino acid, postoperative routine anticoagulant.
All patients were screened by color Doppler ultrasound before operation and on the 1st, 3rd, 7th and 14th day after operation. Tranexamic acid was used routinely during operation and after operation, and anticoagulation was used routinely after operation.<br>