AbstractTorsion of the femur (ante‐ or retroversion) is a normal feature of the bone. It is related to the angular difference in orientation between the proximal and distal articulations. Torsion has been studied, bothin vivoand in dry bone, using a variety of techniques, from a traditional goniometer to radiographs and tomography. Problems with the accurate measurement of the angle of femoral torsion have been encountered by many workers, resulting in a wide range of reported values. A pilot study was undertaken to attempt to demonstrate the difficulties in measuring the angle in dry bone. It was demonstrated that, using standard equipment, measurement of this angle has very poor reproducibility. Is it possible, therefore, to measure the angle of femoral torsion accuratel