Antetorsion angle according to Waidelich
The anteversion angle according to Waidelich is the result of a measuring method in medicine , with the help of which the angle between the femoral neck and the shaft of the thighbone ( femur ) is determined. With this measurement method carried out using computed tomography (CT), it is an average of 20.4 ° with a standard deviation of 9 °.
Three cutting planes are selected from CT or X-ray images . The first cutting plane is at the point of maximum dorsal extension of the femoral rolling ridges. The second sectional plane runs through the center of the femoral head and the third through the large turner ( greater trochanter ) distal to the trochanteric fossa or halfway between the greater and lesser trochanter .
This method has been around for a long time, but it also has disadvantages. On the one hand, the height of the cuts depends on the examiner and, on the other hand, it depends on the position of the bone during the X-ray or CT scan. These two parameters can result in different measured angles. This method is used preoperatively and intraoperatively, for. B. used for conversion osteotomies, intramedullary nailing and post-traumatic leg deformities.
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- ^ Hans-Albrecht Waidelich, Wolf Strecker, E. Schneider: Computed tomographic measurement of torsion and length on the lower extremity . In: Röfo. Advances in X-Ray and Imaging Techniques , Vol. 157 (1992), pp. 245-251, ISSN 0340-1618 (English abstract : PMID 1391819 ).
