The grades of DIP showed no correlation with the contents of calcium salts of lumbar vertebrae and coax (r=-0.071, -0.180,P >0.05) as well as the contents of finger bone(r=-0.612,P >0.05).

• DIP关节的级别与手指骨钙盐含量之间不存在有意义的相关性(r=-0.；612；P>0