[A method for measuring the distal torsion of the femoral bone (author's transl)].

: A new method of measuring the distal torsion of the femoral bone is introduced. The term "torsion" is defined, and the etiology of femoral torsion is scrutinized. The sources of error are discussed after a description of the process of measurement and of the calculation of the angle of torsion. The aim and value of this method are, firstly, to supply evidence for the existence of a prearthrosis factor of the patellofemoral joint, and, secondly, to be of practical importance for the consequences of surgery. These consequences will be discussed elsewhere.