 BMD was measured at time intervals 0, 1, 3 and 5-years. All repeated BMD values were interviewed by one investigator and primarily the vertebrae L2-L4 were followed. In case of spinal deformities during the study 38.3 other lumbar levels were followed. The baseline BMD values lumbar spine BMD 0.8390.072 gcm2, femoral neck BMD 0.7590.094gcm2 were similar between the groups. 