GSTM1 and osteoporosis: For example, according to this model as outlined in Fig. 1, a patient with a preoperative Hb of 130 g/L (35 points), SAA of 500 (55 points), BMI of 25 kg/m2 (40 points), history of cerebrovascular disease (54 points), and history of osteoporosis (49 points) undergoing THA surgery, with an operation time of 120 min (47 points) and intraoperative blood loss of 150 mL (45 points), accumulates a total score of 325 points.