Bone mineral density(BMD) manifested that both groups reached the peak point at week 8 (P>0.5) and then declined,especially in the OPFM group.

• 骨密度(BMD)测定显示:两组BMD值8周时均达到高峰(P>0.；5)；随后均降低；OPFM组下降尤为明显;