Patient data
osteoarthritis, overweight, knee joint deformity
OSTEOARTHRITIS, PERIPHERAL VASCULAR DISEASE, CARDIOVASCULAR DISEASE
A prospective study involving patients with osteoarthritis who underwent primary unilateral TKA was conducted from October 2021 to December 2022 in Zhongnan Hospital of Wuhan University. Patients with cardiovascular disease, symptomatic peripheral vascular disease, oral anticoagulation use, severe knee joint deformity, and overweight (body mass index, BMI > 40) were excluded. All patients who met the study criteria were admitted to the hospital three days before surgery and discharged 14 days after surgery. Institutional Ethics approval was given by the institutional review board (IRB 2,019,018), and informed consent was obtained from each patient or candidate. The patients were randomly divided into the tourniquet or nontourniquet group in accordance with a random number table. The result of this randomization was 25 patients in each group. The patient demographics and preoperative hemoglobin levels, which matched well, are summarized in Table 
Patient demographics for tourniquet and non-tourniquet usePreoperative hemoglobin level(g/L) (mean ± SD)IQR, interquartile range; cm, centimeter; kg, kilogram; g/L, gram/litre; BMI, body mass index; SD, standard deviation