Neck Shaft Angle

The neck-shaft angle is the deviation of the femoral neck from the femoral diaphysis, where axes of both structures are co-planar. This is usually measured in a two-dimensional radiograph taken in the antero-posterior (AP) view, which is assumed to be perpendicular to the plane containing the femoral diaphysis and neck. In three dimensions, this projection plane is defined as the plane that contains a line defining the diaphysis and the centre of the femoral head. Joining the centre of the femoral head to a reference point in the femoral neck provides a vector describing the femoral neck. The neck-shaft angle is calculated as the angle between the femoral neck vector and the diaphyseal vector in the plane that contains the diaphyseal vector and the centre of the femoral head. Neck Shaft Angle is in active development; your mileage may vary.

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