Comparison of bone resorption related parameters in peri-screw bone between different time points after surgery.

Data expressed as mean (SD).Intergroup comparison (p1Compare with 1 day;2Compare with 2 weeks;3Compare with 1 month.数据以均值（mean）±标准差（Standard Deviation，SD）表示。组间比较规则如下：p1为与1天组比较；p2为与2周组比较；p3为与1个月组比较。