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Neck axis distance

Last revised by Henry Knipe on 21 Jul 2022

The neck axis distance is a measurement of acetabular version, although it has only been described in one study (c.2022) 1.


On an AP pelvic x-ray, a line (N) is drawn along the axis of the femoral neck bisecting a circle of best fit drawn around the femoral head. The neck axis distance is the measurement between the anterior and posterior acetabular walls along line N 1,2.


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