 Radial and tibial measurements will be taken at the 4 and 20 sites for bone outcomes, proximal to the articular surface of the distal end of the tibia and radius. The 4 and 20 sites represent areas high in trabecular and cortical bone, respectively. Each scan will be acquired with a 0.4 mm voxel size and a slice thickness of 2.4 mm. The anatomic reference line for determination of the distal end of the radius or tibia will be identified by acquisition of a 30 mm planar scout view of the joint line and automatically set by the software at 4 or 20 sites. Image processing and calculation of the bone measures will be determined using the Stratec software version 6.02 d. 