Objective To investigate the changes of the bone mass and metabolic makers in patients with lupus nephritis (LN) after long-time prednisone treatment.Methods Seventy-six 16-45 years old women were divided into three groups:group A(20 cases,healthy controls),group B (25 cases, LN before prednisone therapy) and group C (31 cases, LN after prednisone). Dual-energy X-ray absorptiometry was used to measure BMD.Simultaneously, the serum calcium,phosphate,alkaline phosphate enzyme and the PTH-M,BGP,24-hour urine...