Measurement of femoral torsion with ultrasound: evaluation of a new technique using reference lines on the posterior surface of the femur.
A technique of measuring femoral torsion employing reference lines on the posterior surface of the femur has been described. This technique was evaluated on 27 dry adult femora and then on 40 adult patients. The technique was found to be reliable and reproducible. The values of femoral torsion obtained by this technique is lower than that obtained when anterior reference lines are used.