Analysis of serum biochemical indexes
The levels of serum potassium, sodium, calcium, phosphorus and magnesium ion were in normal range, and other indexes of kidney function were normal in Group A. More details are shown in Fig. Average serum potassium, sodium, calcium, phosphorus and magnesium ion levels in Group A patients preoperatively, 2-days postoperatively, 3-months postoperatively and 6-months postoperatively. Therefore, the postoperative serum metal ions did not change significantly in Group A patients compared to the preoperative period due to the implantation of the biodegradable magnesium screw, which also proved the safety of the biodegradable magnesium screw