Comparison of bone metabolism indexes between the two groups. A: Ca; B: ALP; C: P. Note: 1. Control group before treatment; 2. Control group after treatment; 3. Study group before treatment; 4. Study group after treatment. Compared with Pre-treatment, ***P < 0.001; Compared with the control group, ###P < 0.001. Ca, calcium; P, blood phosphorus; ALP, alkaline phosphatase.