Fluoroscopic and Magnetic Resonance Cross-Sectional Imaging Assessments of Radial and Ulnar Torsion Profiles in Volunteers

Fluoroscopy coupled with goniometry is a valuable method for assessing the torsion profile of the ulna. MR cross-sectional imaging is better to assess the torsion profile of the radius; however, a side difference in torsion profile of up to 35° for the radius and of up to 20° for the ulna should be considered physiologic. Hence, only side differences greater than these limits may serve as an indication for an axial osteotomy in the clinical setting.